LSAT Logic Games : Solving two-variable logic games

Study concepts, example questions & explanations for LSAT Logic Games

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Example Questions

Example Question #301 : Lsat Logic Games

A barista has seven boxes of tea and coffee of varying types, which she places in a line behind the counter.  There are four types of coffee: Colombian, Dark, Espresso, and French.  There are three types of tea: Green, Herbal, and Vanilla. The following rules apply:

A box of tea must be fifth

No tea may be placed next to another tea

Herbal may not be next to either Colombian or Espresso

At least two boxes must be between Colombian and Dark

 

Which of the following could be the order of the boxes?

Possible Answers:

Espresso, Vanilla, Colombian, Green, Herbal, Dark, French

Vanilla, Colombian, Green, Espresso, Herbal, Dark, French

Green, French, Herbal, Dark, Espresso, Vanilla, Colombian

Green, French, Herbal, Dark, Vanilla, Espresso, Colombian

Green, French, Herbal, Dark, Vanilla, Colombian, Espresso

Correct answer:

Green, French, Herbal, Dark, Vanilla, Espresso, Colombian

Explanation:

Each incorrect answer violates one or more of the rules.  Carefully apply the rules to eliminate the incorrect answers.

Example Question #41 : Solving Two Variable Logic Games

A barista has seven boxes of tea and coffee of varying types, which she places in a line behind the counter.  There are four types of coffee: Colombian, Dark, Espresso, and French.  There are three types of tea: Green, Herbal, and Vanilla. The following rules apply:

A box of tea must be fifth

No tea may be placed next to another tea

Herbal may not be next to either Colombian or Espresso

At least two boxes must be between Colombian and Dark

Which of the following cannot be true?

Possible Answers:

Two boxes of coffee are next to each other

Tea is both first and last

Coffee is both first and sixth

Coffee is third and fourth

Coffee is both first and last

Correct answer:

Coffee is both first and last

Explanation:

If coffee were first and last, then two boxes of tea would need to be next to each other. Since one box would need to be fifth and since we could not put tea first or seventh, there is no way to separate all the boxes of tea.

Example Question #42 : Solving Two Variable Logic Games

A barista has seven boxes of tea and coffee of varying types, which she places in a line behind the counter.  There are four types of coffee: Colombian, Dark, Espresso, and French.  There are three types of tea: Green, Herbal, and Vanilla. The following rules apply:

A box of tea must be fifth

No tea may be placed next to another tea

Herbal may not be next to either Colombian or Espresso

At least two boxes must be between Colombian and Dark

When Herbal is third, which of the following must be true?

Possible Answers:

Green is fifth

When Dark is fourth, Espresso is seventh

When Dark is fourth, Colombian is first

When Colombian is seventh, French is second

When Colombian is first, French is second

Correct answer:

When Colombian is first, French is second

Explanation:

First, you must notice that Dark Coffee and French Coffee always must be on either side of Herbal when Herbal is not first or last.  Otherwise, Herbal would need to be next to another tea, Colombian, or Espresso. If Colombian is first, then there can only be two boxes between Colombian and Dark if French is second and Dark is fourth.

Example Question #311 : Lsat Logic Games

A florist is delivering flowers to several different companies. The flowers she delivers are a Lilac, a Marigold, a Narcissus, an Orchid, a Petunia and a Queen of Sheba. No two flowers are delivered to the same address. The order in which she delivers the flowers must conform to the following restrictions:

She must deliver the Lilac at some time before the Narcissus

The Petunia must be delivered either first or last

If the Narcissus is delivered third, then the Queen of Sheba is delivered fifth

The Orchid cannot be either the fourth or fifth flower to be delivered

If the Narcissus is the third flower to be delivered, all of the following could be true EXCEPT:

Possible Answers:

The Lilac is delivered first

The Marigold is delivered second

The Orchid is delivered second

The Petunia is delivered sixth

The Petunia is delivered first

Correct answer:

The Marigold is delivered second

Explanation:

If the Narcissus is delivered third, the Queen of Sheba must be delivered sixth in accordance with the conditional. The Petunia can still either be delivered first or last. If we place the Petunia in the fist spot, the Lilac must be second in order to be delivered before the Narcussis. We then must place the Orchid in the last spot in order to avoid the fourth spot, and then the Marigold fills in the fourth spot. This yields the solution: Petunia, Lilac, Narcissus, Marigold, Queen of Sheba, Orchid. If we place the Petunia in the last spot the Lilac and the Orchid fill out the first and second spots, in either order. The final open spot is the fourth, which is filled by the Marigold. The only answer choice that is never represented in these scenarios is the Marigold in the second spot.

Example Question #312 : Lsat Logic Games

A florist is delivering flowers to several different companies. The flowers she delivers are a Lilac, a Marigold, a Narcissus, an Orchid, a Petunia and a Queen of Sheba. No two flowers are delivered to the same address. The order in which she delivers the flowers must conform to the following restrictions:

She must deliver the Lilac at some time before the Narcissus

The Petunia must be delivered either first or last

If the Narcissus is delivered third, then the Queen of Sheba is delivered fifth

The Orchid cannot be either the fourth or fifth flower to be delivered

Which of the following is a complete and accurate possible list of deliveries in order?

Possible Answers:

Lilac, Marigold, Orchid, Queen of Sheba, Petunia, Narcissus

Narcissus, Orchid, Lilac, Queen of Sheba, Marigold, Petunia

Marigold, Queen of Sheba, Lilac, Narcissus, Orchid, Petunia

Orchid, Lilac, Narcissus, Marigold, Queen of Sheba, Petunia

Petunia, Lilac, Narcissus, Queen of Sheba, Marigold, Orchid

Correct answer:

Orchid, Lilac, Narcissus, Marigold, Queen of Sheba, Petunia

Explanation:

This is a standard "grab a rule" problem. We can go through each anser eliminating based on rule violations. The only answer left will be the correct answer.

Example Question #41 : Solving Two Variable Logic Games

A florist is delivering flowers to several different companies. The flowers she delivers are a Lilac, a Marigold, a Narcissus, an Orchid, a Petunia and a Queen of Sheba. No two flowers are delivered to the same address. The order in which she delivers the flowers must conform to the following restrictions:

She must deliver the Lilac at some time before the Narcissus

The Petunia must be delivered either first or last

If the Narcissus is delivered third, then the Queen of Sheba is delivered fifth

The Orchid cannot be either the fourth or fifth flower to be delivered

If she delivers the Petunia at some time before she delivers the Queen of Sheba, which of the following must be true?

Possible Answers:

The Queen of Sheba is delivered fifth

The Narcissus cannot be delivered third

The Narcissus cannot be delivered second

The Orchid is delivered sixth

The Lilac cannot be delivered second

Correct answer:

The Narcissus cannot be delivered second

Explanation:

If the Petunia is delivered before any other flower, we know that it must be first due to the restriction that the Petunia can only be delivered either first or last. The earliest possible spot for any of the other flowers to be delivered is now the second spot. When we take into consideration the rule that the Lilac must be delivered at some time before the Narcissus, we know that the Narcissus cannot be delivered second, since that would not allow any space for the Lilac to be delivered before it.

Example Question #41 : Solving Two Variable Logic Games

A florist is delivering flowers to several different companies. The flowers she delivers are a Lilac, a Marigold, a Narcissus, an Orchid, a Petunia and a Queen of Sheba. No two flowers are delivered to the same address. The order in which she delivers the flowers must conform to the following restrictions:

She must deliver the Lilac at some time before the Narcissus

The Petunia must be delivered either first or last

If the Narcissus is delivered third, then the Queen of Sheba is delivered fifth

The Orchid cannot be either the fourth or fifth flower to be delivered

If the Petunia and the Orchid are delivered consecutively, which of the following could be true?

Possible Answers:

The Narcissus is delivered third and the Marigold is delivered sixth

The Queen of Sheba is delivered third and the Lilac is delivered sixth

The Marigold is delivered second and the Lilac is delivered third

The Lilac is delivered third and the Queen of Sheba is delivered fifth

The Lilac is delivered first and the Narcissus is delivered second

Correct answer:

The Lilac is delivered third and the Queen of Sheba is delivered fifth

Explanation:

In this question we are given the new stipulation that the Petunia and the Orchid must be delivered consecutively. Since the Petunia can only occupy the first or last spot and we know that the Orchid cannot be in the fifth spot, they must occupy the first and second spots, respectively. Therefore any anwer that has any other flower in either the first or second spot cannot be correct. The Lilac can never be delivered last, so we can eliminate that answer, and similarly the Narcissus cannot be delivered third in this game because there would be no room for the Lilac to come before it. The correct answer yields the following order: Petunia, Orchid, Lilac, Narcissus, Queen of Sheba, Marigold.

Example Question #312 : Linear Games

A barista has seven boxes of tea and coffee of varying types, which she places in a line behind the counter.  There are four types of coffee: Colombian, Dark, Espresso, and French.  There are three types of tea: Green, Herbal, and Vanilla. The following rules apply:

A box of tea must be fifth

No tea may be placed next to another tea

Herbal may not be next to either Colombian or Espresso

At least two boxes must be between Colombian and Dark

If a rule is added that requires exactly two boxes to be after French and before Green, which of the following could be true?

Possible Answers:

French is sixth

Green is seventh

Green is third

French is third

French is first

Correct answer:

Green is seventh

Explanation:

Since a tea must be fifth, Green cannot be fourth or sixth (otherwise it would be adjacent to another tea).  As a result, Green could only be fifth or seventh.  French could only be second or fourth.   

Example Question #312 : Lsat Logic Games

Three English runners--Albert, Barry, and Carl--are competing in a race with three German runners--Dieter, Franz, and Hans. The order in which the six runners will finish the race is subject to the following conditions:

Hans will finish the race before Carl and Dieter.

Franz will finish the race immediately after Barry.

Carl will finish the race sometime before Barry.

A German runner will finish the race first.

No English runner will be the last to finish the race.

 

Which of the following could be the order, from first to last, in which the runners finish the race?

Possible Answers:

Albert, Hans, Dieter, Carl, Barry, Franz

Hans, Carl, Albert, Franz, Barry, Dieter

Hans, Carl, Barry, Franz, Dieter, Albert

Albert, Hans, Carl, Barry, Franz, Dieter

Hans, Albert, Carl, Dieter, Barry, Franz

Correct answer:

Hans, Albert, Carl, Dieter, Barry, Franz

Explanation:

The correct answer choice is the only one that does not violate one or more conditions. Albert can never finish first because only a German runner can finish the race first. Albert cannot finish last for the same reason. Barry must always finish immediately before Franz.

Example Question #313 : Lsat Logic Games

Three English runners--Albert, Barry, and Carl--are competing in a race with three German runners--Dieter, Franz, and Hans. The order in which the six runners will finish the race is subject to the following conditions:

Hans will finish the race before Carl and Dieter.

Franz will finish the race immediately after Barry.

Carl will finish the race sometime before Barry.

A German runner will finish the race first.

No English runner will be the last to finish the race.

If a German runner finishes the race fifth, which of the following must be true?

Possible Answers:

Carl finishes the race immediately after Albert.

Franz finishes the race last.

Franz finishes the race first.

Albert finishes the race immediately after Hans.

Barry finishes the race fourth.

Correct answer:

Barry finishes the race fourth.

Explanation:

Under this scenario, Barry must finish the race fourth. Because a German runner must finish both first and last, the English runners must finish second, third, and fourth. Barry, however, has the additional requirement of finishing immediately before Franz. Therefore Barry must finish fourth, with Franz fifth, and Dieter last.

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