GMAT Math : Understanding diagrams

Study concepts, example questions & explanations for GMAT Math

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Example Questions

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Example Question #1 : Understanding Diagrams

In a room filled with 100 people, 52 are men and 40 are blonde. There were 16 blonde men in the room. How many non-blonde women were there? Use the following diagram.

Gmat_number_2

Possible Answers:

Correct answer:

Explanation:

Of the  people,   were either men or blonde or both. Therefore,  are non-blonde and non-men (women).

 

Example Question #206 : Gmat Quantitative Reasoning

Graph

The above circle graph shows the results of a school election. According to the rules, the students who finish first, second, and third become President, Vice-President, and Secretary-Treasurer respectively. In the event of any tie, a runoff election will be held.

Who was elected Secretary-Treasurer?

Possible Answers:

Wells

There will be a runoff between Crieghton and Wells

Crieghton

Hawley

There will be a runoff between Wells and Hawley

Correct answer:

Wells

Explanation:

The third-largest portion of the graph is the gray portion, which represents Wells. Wells won the office of Secretary-Treasurer outright.

Example Question #2 : Understanding Diagrams

The above table shows the results of a school election. According to the rules, the students who finish first, second, and third become President, Vice-President, and Secretary-Treasurer respectively. In the event of any tie, a runoff election will be held.

Who was elected Secretary-Treasurer?

Possible Answers:

Jones and Wells will have a runoff to determine who will be Secretary-Treasurer.

Smith and Wells will have a runoff to determine who will be Secretary-Treasurer.

Jones and Smith will have a runoff to determine who will be Secretary-Treasurer.

Jones

Smith

Correct answer:

Jones and Smith will have a runoff to determine who will be Secretary-Treasurer.

Explanation:

Jones and Smith tied for third (87 each), so by the rules, there will be a runoff election for the office of Secretary-Treasurer between these two.

Example Question #3 : Understanding Diagrams

The table below gives the population of the city of Renfrow for each of six census years.

 

 

Which decade saw a population decline?

Possible Answers:

Correct answer:

Explanation:

The only census year in which Renfrow had fewer people than the previous one is 1970, so the correct choice is 1960-70.

Example Question #4 : Understanding Diagrams

The table below gives the population of the city of Renfrow for each of six census years.

 

 

Which decade saw the greatest increase in population?

Possible Answers:

Correct answer:

Explanation:

For each decade, we can subtract the population at the beginning of the decade from that at the end. We omit 1960-70 since there was a population decline.

1950-60 saw the greatest increase.

Example Question #210 : Gmat Quantitative Reasoning

The table below gives the population of the city of Renfrow for each of six census years.

 

 

The figures for subsequent years are not currently available but it is known that the increase over each decade since 1980 has been at least as great as the increase from 1970 to 1980. What was the minimum population in 2010?

Possible Answers:

Correct answer:

Explanation:

The increase in population from 1970 to 1980 was . Since each of the three ten-year growths from 1980 to 2010 was at least that much, the minimum population of Renfrow in 2010 was 

Example Question #5 : Understanding Diagrams

The above is the menu at Monorail Sandwich Shop. 

Monorail is running a special today - for each sandwich you buy, you can purchase one large soda for ninety cents or get one small soda for free. 

Kevin purchases three beef sandwiches, two large sodas, and two small sodas. Disregarding tax, how much will he pay?

Possible Answers:

Correct answer:

Explanation:

Kevin will pay $5.89 each for the three beef sandwiches. He will pay $0.90 for each of the two large sodas and get one of the small sodas for free; he will pay the full price of $1.09 for one small soda. Therefore, Kevin will pay

 

Example Question #6 : Understanding Diagrams

Five candidates ran for the office of student body president at Garfield High School. According to the rules, the student who gets the most votes wins the office, with ties resulting in a runoff. However, Garfield has an unusual rule that states that seniors' votes count double. 

This table shows how freshmen, sophomores, and juniors voted:

This table shows how seniors voted:

Who won the election?

Possible Answers:

Trask

Smith 

Crane

Crane and Jones will face each other in a runoff.

Jones

Correct answer:

Jones

Explanation:

For each candidate, add the number of freshman, sophomore, and junior votes to twice the number of senior votes:

Jones won the election.

Example Question #7 : Understanding Diagrams

Five candidates ran for the office of student body president at Buchanan High School. According to the rules, the student who gets a majority of the votes wins the office; if no student wins a majority, then there will be a runoff between the top two vote-getters. However, Buchanan has an unusual rule that states that seniors' votes count double. 

This table shows how freshmen, sophomores, and juniors voted:

This table shows how seniors voted:

Who won the election?

Possible Answers:

Crane and Jones will face each other in a runoff.

Jones and Trask will face each other in a runoff.

Crane and Trask will face each other in a runoff.

Trask won outright.

Jones won outright.

Correct answer:

Jones and Trask will face each other in a runoff.

Explanation:

For each candidate, add the number of freshman, sophomore, and junior votes to twice the number of senior votes:

Jones got the most votes. However, he clearly did not win a majority, so he and the second-highest vote-getter, Trask, will face each other in a runoff.

Example Question #8 : Understanding Diagrams

Pie_graph

Light blue: Goodman

Orange: Ferris

Gray: Inman

Yellow: Jones

Dark blue: Harris 

Refer to the diagram. If 3,145 people voted in the school board election, (the results of which are represented in the diagram), then approximately how many people voted for Inman?

Possible Answers:

Correct answer:

Explanation:

According to the legend, the gray sector represents the portion of the electorate who voted for Inman. This sector is about one-fifth of the circle, so, to find the best estimate of Inman's share of the vote, take one-fifth of 3,145 - or, equivalently, divide 3,145 by 5:

630 is the best estimate of the choices given.

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