GMAT Verbal Quiz: Identify Assumptions

What this quiz covers

This quiz focuses on Identify Assumptions, giving you a quick way to practice the rules, question types, and explanations that matter most for GMAT Verbal.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. Tourists who visit the neighboring city's aquarium would be equally interested in visiting an aquarium in the officials' city.
2. Corporate sponsors will compete to buy the naming rights at a price sufficient to cover the city's construction costs. (correct answer)
3. Local residents are more concerned about potential tax increases than about corporate naming of public attractions.
4. The construction costs of the proposed aquarium will not exceed those of the neighboring city's aquarium.

Explanation: This question tests your ability to identify necessary assumptions in arguments about cause and effect. When city officials claim their aquarium plan "will not burden local taxpayers," you need to find what must be true for their reasoning to work. The officials' logic flows like this: a neighboring city used corporate naming rights to finance their aquarium, which now generates tourist revenue, so our identical financing method will similarly avoid burdening taxpayers. The critical gap here is whether corporate sponsors will actually pay enough to cover construction costs. If naming rights only generate partial funding, taxpayers would still face a burden, contradicting the officials' conclusion. Choice B correctly identifies this assumption. Without corporate sponsors paying sufficient amounts to cover construction costs, the financing plan fails and taxpayers bear the remaining burden. Choice A misses the mark because the argument doesn't require tourists to be "equally interested" in both aquariums. Even if fewer tourists visit, the argument only needs the aquarium to avoid taxpayer burden through corporate financing, not match the neighbor's exact revenue. Choice C introduces an irrelevant comparison about what residents care about more. The argument's validity doesn't depend on residents' preferences between taxes and corporate naming. Choice D incorrectly focuses on construction cost comparisons. The officials' argument works regardless of whether their aquarium costs more or less than the neighbor's, as long as corporate naming rights cover whatever the actual costs are. Strategy tip: In assumption questions, look for gaps between the evidence and conclusion. The correct assumption will bridge that gap and be absolutely necessary for the argument to hold.

Question 2

1. Clients respond more positively to digital presentations than to printed materials in every industry segment the company targets.
2. The sales representatives who currently rely on printed materials will use the tablets as effectively as those already using them. (correct answer)
3. The cost of purchasing tablets for all sales representatives will not exceed the additional revenue gained from increased sales.
4. Sales representatives who currently use tablets will continue to do so even if the company standardizes the practice.

Explanation: This question tests your ability to identify necessary assumptions in causal reasoning arguments. When an argument concludes that implementing a change will produce specific results, you need to find what must be true for that conclusion to hold. The argument moves from "sales reps using tablets close 15% more deals" to "giving all reps tablets will raise overall sales by at least 15%." For this logic to work, the company must assume that the sales reps who aren't currently using tablets (those relying on printed materials) will achieve the same level of success with tablets as those already using them effectively. This is choice B. Choice A is too extreme and unnecessary. The conclusion could still hold even if tablets aren't better in every single industry segment, as long as the overall effect reaches 15%. Choice C addresses cost-benefit analysis, but the argument's conclusion is purely about sales increases, not profitability. The assumption about costs isn't required for the stated conclusion to be valid. Choice D misses the point entirely—the argument is about equipping those who don't currently use tablets, not about whether current tablet users will continue their practice. The key trap here is confusing what's practically wise (like cost considerations in C) with what's logically necessary for the argument's reasoning. Choice B identifies the critical gap: assuming that different groups of people will perform equally well with the same tool, which is essential for projecting the 15% increase company-wide. Strategy tip: In assumption questions, focus on what must be true for the logic to work, not what would be smart business practice.

Question 3

1. The cost of redesigning and manufacturing the new bottle will not exceed the incremental revenue from increased sales.
2. Consumers who currently purchase competing perfumes will be attracted by the new bottle design.
3. Factors other than packaging, such as scent and price, are not the primary reasons for the perfume's decline in sales. (correct answer)
4. ChemLuxe can secure trademark protection for the proposed bottle design to prevent imitation by competitors.

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that must be true for the argument to work. The consultant's logic flows like this: packaging drives consumer decisions → changing to contemporary packaging → increased sales. The correct answer is C because the consultant's recommendation only makes sense if packaging is indeed the main problem. If the perfume's declining sales stem primarily from other factors like an outdated scent, high price, or poor quality, then redesigning the bottle won't address the root cause. The consultant assumes that non-packaging factors aren't the primary culprits behind the sales decline. Looking at the wrong answers: A addresses cost-benefit analysis, which is a practical consideration but not a logical assumption underlying the consultant's reasoning about consumer behavior. B suggests the new design will attract competitors' customers, but the consultant's argument works even if it only retains current customers or attracts entirely new ones. D focuses on trademark protection, which relates to long-term competitive advantage but isn't necessary for the basic premise that better packaging increases sales. The key strategy for assumption questions is the "negation test" - if you negate the correct assumption, the argument should fall apart. If you negate C (suppose other factors ARE the primary reason for declining sales), then changing packaging becomes pointless, destroying the consultant's recommendation. Always look for the assumption that, if removed, makes the entire argument crumble.

Question 4

1. Students will not bring sugar-sweetened beverages from outside sources into the school.
2. Obesity among the school's students is currently higher than the national average.
3. School cafeterias are the primary source of beverages consumed by the students during school hours. (correct answer)
4. Many students choose sugar-free beverages when those drinks are prominently displayed.

Explanation: When you encounter assumption questions on the GMAT, you're looking for unstated premises that must be true for the argument to work. The argument here moves from "sugar-sweetened beverages contribute to obesity" to "banning them from cafeterias will substantially reduce obesity." There's a logical gap between these statements. The correct answer is C because the nutritionist assumes that school cafeterias are the primary source of beverages during school hours. Without this assumption, the ban would have minimal impact. If students mostly drink beverages from other sources (vending machines, packed lunches, water fountains), then eliminating cafeteria drinks wouldn't substantially reduce their sugar intake or obesity rates. The word "substantially" in the conclusion is key—it requires that cafeterias be a major source of beverage consumption. Let's examine why the other options fail: A is too extreme—the argument doesn't require that students never bring outside drinks, just that cafeterias are the primary source. Some students could bring drinks and the argument could still work. B is irrelevant—whether obesity rates are above or below national average doesn't affect whether a cafeteria ban will reduce them. D actually weakens the argument by suggesting students might choose sugar-free options anyway, making a ban less necessary. For assumption questions, use the negation test: if you negate the correct assumption, the argument should fall apart. If cafeterias aren't a primary beverage source, then banning cafeteria drinks won't substantially reduce obesity—exactly what happens when we negate C.

Question 5

1. the government of Country X can finance broadband expansion without cutting other important programs
2. rural residents will adopt broadband service once it becomes affordable and accessible (correct answer)
3. countries with strong economic growth also spend more to maintain and upgrade Internet infrastructure
4. businesses in Country X already possess the expertise to leverage improved connectivity

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that must be true for the argument to work. The economist argues that because countries with higher Internet penetration have stronger growth, expanding broadband to rural areas will accelerate Country X's economic growth. The correct answer is (B) because the economist's reasoning contains a critical gap. The argument assumes that making broadband "affordable and accessible" will automatically translate into higher Internet penetration rates. But affordability and accessibility don't guarantee adoption. If rural residents don't actually use the broadband service once it's available, then Country X's overall Internet penetration won't increase, breaking the causal chain the economist relies on. Choice (A) addresses implementation logistics, but the economist's conclusion about economic growth doesn't depend on how the expansion is financed. The argument would hold even if financing required trade-offs. Choice (C) reverses the causal relationship—the economist claims Internet penetration drives growth, not that growth drives Internet spending. Choice (D) focuses on business expertise, but the economist's argument is based purely on the correlation between Internet penetration and growth, without specifying how that growth occurs. Remember that assumption questions often test whether you can spot gaps between evidence and conclusion. Look for missing links in the logical chain. Here, the economist jumps from "making broadband available" to "increased economic growth" without considering whether people will actually use what's being provided.

Question 6

1. The electricity used to charge EVs will be generated primarily from renewable resources rather than from fossil fuels.
2. Urban residents will be willing to pay higher upfront costs associated with purchasing EVs.
3. Tailpipe emissions from gasoline cars are a major contributor to urban air pollution. (correct answer)
4. Battery-recycling programs will keep hazardous materials out of landfills.

Explanation: When you encounter an assumption question on the GMAT, you're looking for an unstated premise that the argument requires to be valid. The advocate argues that replacing gasoline cars with EVs will improve urban air quality because EVs have no tailpipe emissions. The correct answer is C because the argument only works if tailpipe emissions actually matter for urban air quality. If gasoline cars' tailpipe emissions weren't a major contributor to urban air pollution, then eliminating them wouldn't "greatly improve" air quality. The advocate assumes this connection exists but never explicitly states it. Let's examine why the other choices aren't necessary assumptions. Choice A addresses where electricity comes from, but the advocate's argument is specifically about tailpipe emissions versus no tailpipe emissions—the source of electricity doesn't affect whether eliminating tailpipe pollutants improves air quality. Choice B concerns consumer willingness to pay, but the argument assumes replacement will happen and focuses on the environmental consequence, not the economic feasibility. Choice D deals with battery disposal, which is irrelevant to the advocate's claim about tailpipe emissions and air quality. Here's a useful test for assumption questions: try negating each answer choice and see if it destroys the argument. If you negate C (tailpipe emissions aren't a major contributor), the argument falls apart—removing a minor pollution source wouldn't greatly improve air quality. Negating the other choices doesn't break the core logic. Remember: assumption questions ask what must be true for the argument to work, not what would strengthen it or make it more complete.

Question 7

1. The company's current staff of editors can adapt quickly to producing specialized texts without significant retraining.
2. Free online encyclopedias will not begin offering specialized reference content aimed at niche professionals.
3. Demand for specialized printed reference books among niche professionals is sufficient to offset the loss of encyclopedia revenue. (correct answer)
4. Printed encyclopedias will continue to decline in popularity even if their prices are reduced.

Explanation: When you encounter an assumption question, you're looking for an unstated premise that the argument depends on to work. The publisher's plan involves a major business pivot: abandoning encyclopedia production to focus exclusively on specialized reference books for niche professionals. The correct answer is C because the publisher's entire strategy hinges on generating enough revenue from this new market segment to replace their lost encyclopedia sales. Without sufficient demand from niche professionals, the plan fails completely. This assumption is so fundamental that if it were false, the publisher's solution wouldn't address their profitability problem at all. Let's examine why the other choices aren't necessary assumptions: A assumes the current staff can adapt without retraining, but the publisher could hire new specialized editors or provide training—the plan doesn't require using existing staff unchanged. B suggests online encyclopedias won't expand into specialized content, but even if they do, there could still be enough demand for printed specialized books to make the plan work. D assumes printed encyclopedias will keep declining regardless of price cuts, but this doesn't matter since the publisher has already decided to abandon encyclopedias entirely rather than lower prices. Remember that assumptions are unstated premises that must be true for the argument to succeed. Look for the gap between what's stated and what's concluded. In business plan questions like this, always check whether the proposed solution actually addresses the core problem—here, the assumption that the new revenue stream will be adequate is essential for the plan's success.

Question 8

1. other factors contributing to bleaching, such as pollution, are less significant in Reef Q than in most reefs
2. shade structures can lower water temperature around corals enough to reduce bleaching (correct answer)
3. funding for large-scale shade installations will be available from environmental organizations
4. the local fishing community will support construction of shade structures over fishing grounds

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that must be true for the argument to work. The argument here claims that shade structures will reverse coral bleaching damage because water temperature drives bleaching. The correct answer is B because it identifies the critical gap in reasoning. The biologist jumps from "water temperature causes bleaching" to "shade structures will help" without establishing that shade structures actually reduce water temperature sufficiently. This connection isn't obvious—shade structures might not lower water temperature enough to matter, or might create other problems. For the argument to succeed, we must assume shade structures effectively reduce water temperature around corals. Let's examine why the other choices don't work: A discusses the relative importance of other factors like pollution, but the argument already acknowledges temperature as the "principal" driver, making this comparison irrelevant to the core logic. C addresses funding availability, which is about implementation feasibility rather than whether the solution would work in principle. D focuses on community support, again addressing practical concerns rather than the logical connection between the proposed solution and the desired outcome. Remember that assumption questions ask what must be true for the argument's logic to hold, not what would make the plan practically feasible. Focus on finding the missing link between the evidence presented and the conclusion drawn—often it's a gap about whether the proposed solution actually addresses the identified cause.

Question 9

1. regions that adopted health measures rapidly had few other advantages over regions that did not
2. town-hall meetings in the 1800s were primarily forums for discussing public-health initiatives
3. the same archival records measured both the frequency of meetings and the timing of health-measure adoption accurately
4. the presence of town-hall meetings, rather than some other factor, was responsible for the adoption of public-health measures (correct answer)

Explanation: This question tests your ability to identify necessary assumptions in causal reasoning. When an author claims that one thing caused another based on correlation, they must assume no alternative explanations exist. The historian observes a correlation: regions with more town-hall meetings also adopted public-health measures faster. From this, they conclude the meetings caused the faster adoption. This is a classic correlation-to-causation argument that requires a crucial assumption. Choice D captures this essential assumption perfectly. For the historian's causal conclusion to be valid, they must assume that town-hall meetings themselves—not some other factor—drove the health improvements. Without this assumption, alternative explanations could undermine the entire argument. Perhaps wealthier regions had both more meetings and better health infrastructure, or maybe more educated populations created both phenomena. Choice A is incorrect because the historian doesn't need to assume other regions lacked advantages—only that meetings specifically caused the health improvements. Choice B misses the mark because meetings don't need to focus primarily on health; they could discuss health among other topics and still influence adoption. Choice C addresses data accuracy, which is important but not the core logical gap—even with perfect data, correlation doesn't prove causation. When you encounter causal arguments on the GMAT, immediately ask: "What else could explain this relationship?" The correct assumption will typically eliminate alternative explanations or strengthen the proposed causal link between the two correlated phenomena.

Question 10

1. Competitor agencies do not also intensify promotion of travel insurance at the same time.
2. Customers who buy expensive tours rarely cancel their trips even when insured.
3. The profit margin on selling insurance compensates for the effort of promoting it to all customers.
4. Customers who would not otherwise buy expensive tours will decide to do so after purchasing travel insurance. (correct answer)

Explanation: Critical reasoning questions on the GMAT often test your ability to identify unstated assumptions that connect evidence to conclusions. When you see an argument making a causal leap, look for what must be true for that reasoning to work. The travel agency observes that customers who buy insurance also tend to book expensive tours, then concludes that promoting insurance will increase expensive tour sales. This reasoning assumes a specific causal relationship: that insurance somehow encourages expensive tour purchases. For this strategy to work, the agency must assume that customers who wouldn't normally buy expensive tours will change their behavior after getting insurance. Answer D captures this essential assumption perfectly. If insurance doesn't influence customers' tour-buying decisions—if people who buy expensive tours simply happen to also buy insurance for other reasons—then promoting insurance won't boost expensive tour sales. Let's examine why the other choices miss the mark. Choice A about competitor actions is irrelevant to whether the agency's internal strategy will work. Choice B discusses trip cancellation behavior, which doesn't address whether insurance promotion leads to expensive tour purchases. Choice C focuses on the profitability of selling insurance itself, but the agency's goal is increasing expensive tour sales, not insurance profits. The key trap here is confusing correlation with causation. Just because two behaviors occur together doesn't mean one causes the other. On GMAT assumption questions, always ask: "What gap exists between the evidence and conclusion?" The answer will bridge that logical gap, making the argument's reasoning possible.

Question 11

1. The cost of purchasing and installing new trash bins is less than that of repairing flood damage.
2. Maintenance crews will empty the additional trash bins frequently enough to prevent overflow.
3. Pedestrians are responsible for most litter that reaches storm drains in the downtown area. (correct answer)
4. Existing environmental regulations already prohibit littering within city limits.

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that must be true for the argument to work. The city official argues that adding trash bins will solve flooding because storm drains clog with litter. This reasoning contains a logical gap you need to identify. The correct answer is (C) because the official's solution assumes that pedestrians—not other sources like wind-blown debris, construction materials, or natural elements—are the primary cause of litter reaching storm drains. If most litter comes from sources other than pedestrians, then adding trash bins for pedestrian use wouldn't address the real problem. The argument depends on pedestrians being the main culprits for this solution to be effective. Looking at the wrong answers: (A) focuses on cost-effectiveness, which isn't necessary for the argument about whether the solution will work—just whether it's worth implementing. (B) addresses bin maintenance, but the official's argument doesn't require this assumption since overflowing bins could still reduce street litter compared to having no bins. (D) mentions regulations, but existing anti-littering laws don't affect whether adding bins will reduce litter—people might follow rules better when disposal is convenient, regardless of current regulations. Strategy tip: On assumption questions, use the "negation test"—if you negate the correct assumption, it should destroy the argument. If pedestrians aren't responsible for most litter (negating C), then adding pedestrian trash bins won't solve the flooding problem, which kills the official's argument.

Question 12

1. patients will perceive the marketing claims as credible and trustworthy
2. physicians are willing to prescribe the new medication as readily as the competitor's drug
3. insurance companies will reimburse the new medication at the same rate as the competitor's drug
4. side-effect severity is a primary factor influencing patients' choice of allergy medication (correct answer)

Explanation: When you encounter a GMAT question asking what an argument "depends on assuming," you're looking for a necessary assumption—something that must be true for the argument's reasoning to work, even though it wasn't explicitly stated. The pharmaceutical company's argument follows this logic: fewer reported side effects → marketing about mild side effects → patients will switch. For this chain of reasoning to hold, the company must assume that side effects actually matter to patients when choosing medications. If patients don't care much about side effects compared to other factors like price, effectiveness, or brand familiarity, then emphasizing mild side effects won't persuade them to switch. Answer choice D captures this essential assumption—that side-effect severity significantly influences patient choice. Let's examine why the other options aren't necessary assumptions. Choice A about credibility is too narrow; even if some patients find the claims credible, the argument could still work. Choice B regarding physician prescribing habits isn't required—the argument focuses on what will persuade patients, not whether doctors will cooperate. Choice C about insurance reimbursement similarly addresses a factor the company didn't consider in their reasoning about side-effect marketing. To test necessary assumptions on the GMAT, try the "negation technique": if you negate the correct assumption (imagine patients don't care much about side effects), the argument falls apart. If you negate wrong answers, the argument can still function reasonably well. This technique helps you distinguish truly necessary assumptions from factors that might be helpful but aren't essential to the argument's logic.

Question 13

1. The correlation between music participation and math achievement is consistent across all grade levels.
2. The school can hire additional qualified music teachers without affecting its budget for math instruction.
3. Students will not resent a mandate to take music and thereby become disengaged from other subjects.
4. Participation in music programs, rather than preexisting aptitude, is responsible for higher math scores. (correct answer)

Explanation: When you encounter a "presupposes" question, you're looking for an unstated assumption that the argument depends on to be valid. The administrator observes a correlation between music participation and higher math scores, then concludes that mandatory music classes will raise average math scores. The critical gap in this reasoning is assuming causation from correlation. The administrator's argument only works if music participation actually causes the higher math scores. If students who choose music programs simply have higher natural aptitude or come from more academically supportive backgrounds, then forcing all students into music won't replicate those results. Answer choice D captures this essential assumption—that participation itself, not preexisting factors, drives the performance difference. Let's examine why the other choices miss the mark. Choice A focuses on grade-level consistency, but the argument doesn't require uniform effects across all grades to be valid. Choice B addresses budget concerns, which are irrelevant to whether the cause-and-effect relationship exists. Choice C considers student resentment, but this potential consequence doesn't address the fundamental assumption about what causes higher math scores. The administrator's logic chain is: music participants score higher → mandatory music will raise scores. This only holds if music participation is the actual cause of improvement, not just correlated with it. Strategy tip: In assumption questions, look for the logical gap between evidence and conclusion. Often on the GMAT, arguments confuse correlation with causation—always ask whether there could be alternative explanations for the observed relationship.

Question 14

1. no other advertising strategy improves brand recall as much as humor does
2. the companies that employed humorous advertisements were comparable to the others in respects relevant to brand recall (correct answer)
3. consumers' preference for humorous advertisements will persist into future quarters
4. humorous advertisements are not significantly more expensive to produce than other types of advertisements

Explanation: When you encounter an assumption question in Critical Reasoning, you're looking for an unstated premise that the argument requires to be true. The executive observes that companies using humorous ads had higher brand-recall scores and concludes that humor is the most effective way to improve brand recall. This reasoning has a crucial gap: it assumes the companies being compared are similar in all relevant ways except for their use of humor. If the companies using humorous ads were systematically different—perhaps they had larger advertising budgets, better creative teams, or were already well-established brands—then humor might not be the actual cause of the higher recall scores. Choice (B) captures this essential assumption that the comparison groups were comparable in respects relevant to brand recall. Choice (A) goes too far by claiming humor is the "most effective" strategy, but the executive's conclusion already states this—it's not an underlying assumption. Choice (C) addresses future persistence of consumer preferences, but the executive's argument is based on past quarter data and doesn't require assumptions about the future. Choice (D) concerns cost considerations, which are irrelevant to the executive's claim about effectiveness in improving brand recall. The key strategy for assumption questions is to identify what the argument takes for granted. Look for gaps between the evidence presented and the conclusion drawn. Often, as here, the gap involves assuming that a correlation indicates causation while ruling out alternative explanations. Ask yourself: "What must be true for this reasoning to work?"

Question 15

1. Carp reproduce primarily in shallow shoreline areas where pike commonly hunt.
2. Efforts to remove adult carp through netting are too costly to implement effectively.
3. Predatory birds that feed on pike will not increase in number as a result of the pike introduction.
4. Pike introduced into Lake Z will preferentially prey on carp fry rather than on the fry of native fish species. (correct answer)

Explanation: Assumption questions test your ability to identify unstated premises that must be true for an argument to work. The wildlife manager concludes that introducing pike will decrease carp numbers without threatening native species, but this reasoning has a critical gap. The manager's logic relies on pike feeding on carp fry specifically, but the argument never establishes that pike will target carp rather than native fish. For the plan to work as intended, pike must preferentially prey on the invasive species rather than harming the native fish the manager wants to protect. This makes (D) correct – without this assumption, the entire strategy could backfire by reducing native fish populations instead. Let's examine why the other options aren't necessary assumptions: (A) focuses on where carp reproduce and pike hunt, but the argument doesn't require any specific location for this predation to occur. The manager simply needs pike to eat carp fry somewhere in the lake. (B) addresses alternative removal methods, but the manager's argument stands regardless of whether netting is costly – introducing pike could be the preferred method for many reasons. (C) concerns predatory birds, but even if bird populations increased, this wouldn't invalidate the manager's core claim about pike reducing carp numbers. When tackling assumption questions, use the "negation test": if you negate the correct assumption, the argument should fall apart. If pike don't preferentially target carp fry, the plan won't achieve its goals and could harm native species – exactly what the manager wants to avoid.

Question 16

1. Commercial electricity users will also face higher rates during peak hours under the new scheme.
2. Utilities have the technology to monitor and bill customers accurately under time-of-use pricing.
3. Higher peak-hour rates will not disproportionately burden low-income households.
4. Most households can shift a significant portion of their electricity use to non-peak hours without major inconvenience. (correct answer)

Explanation: When you encounter assumption questions in Critical Reasoning, you're looking for unstated premises that must be true for the argument to work. The economist concludes that time-of-use pricing will reduce peak demand because consumers are price-sensitive. But there's a logical gap: being price-sensitive doesn't automatically mean demand will drop unless consumers can actually change their behavior. The correct answer is D because the argument fundamentally depends on households' ability to shift electricity usage to off-peak times. If most households cannot move significant electricity use away from early evening hours—perhaps because that's when they need lights, cook dinner, or run appliances—then price sensitivity alone won't reduce peak demand. The economist's conclusion requires this flexibility assumption to bridge the gap between "consumers respond to prices" and "peak demand will decrease." A is wrong because the argument focuses specifically on household electricity use; commercial users are irrelevant to this reasoning. B addresses implementation logistics, but the economist's argument assumes the pricing scheme works as intended—technological capabilities aren't part of the core reasoning about consumer behavior. C raises an important social concern, but the economist's argument about demand reduction doesn't depend on equitable distribution of costs. For assumption questions, use the "negation test": if you negate the correct assumption, the argument should fall apart. If households cannot shift usage (negating D), then time-of-use pricing won't reduce peak demand, destroying the economist's conclusion. Always look for the missing link that makes the conclusion logically follow from the premises.

Question 17

1. Other museums in the area will not adopt similar extended hours in response.
2. Operating costs associated with additional evening hours will not exceed the revenue gained from higher attendance.
3. Evening visitors spend as much in the museum shop as daytime visitors do.
4. There remains unmet demand from visitors who can attend only on evenings other than the two currently offered. (correct answer)

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that the argument absolutely requires to be true. The director's logic jumps from "evening hours twice a week increased attendance 20%" to "opening every evening will increase attendance at least another 20%." This projection assumes there are people who want to visit on the five additional evenings but currently cannot. Without unmet demand on those other evenings, extending hours wouldn't attract new visitors—it would just redistribute existing evening visitors across more nights, potentially even reducing attendance per evening. Choice D captures this essential assumption: there must be unmet demand from people who can only attend on evenings other than the current two. Choice A addresses competitive responses, but the director's argument doesn't require this assumption—the projection could still hold even if other museums extended hours. Choice B focuses on profitability rather than attendance levels, which isn't what the director is predicting. Choice C compares spending patterns between visitor types, but the argument only concerns attendance numbers, not revenue per visitor. The director's reasoning fundamentally depends on the existence of a pool of potential evening visitors who are currently unable to attend, making D the necessary assumption. Strategy tip: In assumption questions, ask yourself "What must be true for this conclusion to follow?" Often the correct answer will address a gap between the evidence presented and the conclusion drawn, as the argument typically takes a logical leap that requires an unstated premise.

Question 18

1. Future improvements in battery technology will not eliminate the heat issue associated with fast-charging.
2. Users who fast-charge their phones do so because they have higher overall usage that drains batteries more quickly.
3. Manufacturers do not design batteries specifically to withstand the stress of fast-charging.
4. The additional heat generated during fast-charging accelerates battery degradation more than ordinary use does. (correct answer)

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that the argument depends on to reach its conclusion. The argument must fall apart if the assumption is false. The columnist argues that fast-charging users will need battery replacements sooner because fast-charging generates more heat per cycle. But there's a logical gap here: just because fast-charging produces more heat doesn't automatically mean batteries will degrade faster. The argument assumes that this extra heat actually causes more damage. Choice D captures this crucial assumption perfectly. The columnist's reasoning only works if the additional heat from fast-charging accelerates degradation beyond what normal charging does. Without this assumption, the argument crumbles—extra heat would be irrelevant if it didn't cause additional damage. Choice A is incorrect because the argument concerns current battery behavior, not future technological improvements. The columnist's conclusion stands regardless of what might happen in the future. Choice B misses the mark by focusing on usage patterns rather than the core mechanism. The argument is specifically about heat damage per charging cycle, not about how often people charge their phones. Choice C is wrong because even if manufacturers do design batteries for fast-charging, the columnist could still be correct that heat causes some degree of accelerated wear. Remember: assumption questions test whether you can identify the missing link between evidence and conclusion. Look for what must be true for the argument to work, then test each choice by asking "If this were false, would the argument still hold?"

Question 19

1. Lenders will agree to replace traditional legal language with plain-language versions.
2. Many borrowers currently default because they misunderstand complex mortgage terminology. (correct answer)
3. Regulators will enforce the use of plain-language documents uniformly across the industry.
4. Plain-language documents are equally enforceable in court as traditional contracts.

Explanation: When you encounter assumption questions on the GMAT, you're looking for a statement that must be true for the argument to work. The argument here follows a simple causal chain: plain-language documents → better understanding → fewer defaults. The consumer group's reasoning depends on a critical gap between complex language and borrower behavior. For their solution (plain-language documents) to address the problem (defaults), there must be a connection between language complexity and default rates. Choice B provides exactly this link by assuming that misunderstanding complex terminology actually causes defaults. Without this assumption, the entire argument collapses—if borrowers don't default due to misunderstanding terms, then clearer language won't reduce defaults. Choice A addresses lender cooperation, but the argument is about whether plain language would reduce defaults, not whether lenders will implement it. Choice C focuses on regulatory enforcement, which is irrelevant to the causal relationship between understanding and default rates. The argument doesn't require uniform implementation to be valid. Choice D concerns legal enforceability, but the group's argument is about preventing defaults through better understanding, not about what happens in court after defaults occur. The key strategy for assumption questions is to identify what unstated premise the argument requires to be logical. Look for the gap between evidence and conclusion—often the assumption bridges a causal relationship that the author takes for granted but hasn't explicitly stated.

Question 20

1. The study accurately measured both flossing frequency and cardiovascular health outcomes.
2. People who currently do not floss daily can be persuaded to adopt the habit.
3. Daily flossing itself helps prevent cardiovascular disease rather than merely indicating a generally health-conscious lifestyle. (correct answer)
4. Other risk factors for cardiovascular disease, such as diet, remain constant across the study population.

Explanation: When you encounter assumption questions on the GMAT, you're looking for an unstated premise that the argument requires to be valid. The argument here jumps from correlation (flossers have lower cardiovascular disease rates) to causation (encouraging flossing will reduce disease). The correct answer is C because the official's reasoning depends entirely on flossing being the actual cause of reduced cardiovascular disease. If daily flossing merely signals that someone is generally health-conscious—eating well, exercising, getting regular checkups—then encouraging flossing alone wouldn't reduce cardiovascular disease rates. The argument assumes flossing itself provides the protective benefit, not that it's just a marker of other healthy behaviors. Answer A addresses data accuracy, which isn't the logical gap here. The official accepts the study's findings; the flaw is in interpreting what those findings mean. Answer B focuses on whether people can change their behavior, but this doesn't affect whether the policy would work if people did change. The argument assumes flossing causes the benefit regardless of compliance rates. Answer D suggests controlling for other risk factors, but even a perfectly controlled study showing correlation wouldn't prove that encouraging flossing (as a standalone intervention) would reduce disease. Watch for this pattern on GMAT Critical Reasoning: arguments that leap from "X correlates with Y" to "doing more X will increase Y" almost always assume that X directly causes Y, rather than both being products of some third factor. Always ask yourself whether correlation has been mistaken for causation.