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Henry and Eleanor are waiting in line for a movie. If Henry
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23 Apr 2020, 10:26
23 Apr 2020, 10:26
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Henry and Eleanor are waiting in line for a movie. If Henry is fourth in line, and there are n people ahead of Eleanor, where n > 4, how many people are between Henry and Eleanor?
A. n - 5
B. n - 4
C. n - 3
D. n + 3
E. n + 4
A. n - 5
B. n - 4
C. n - 3
D. n + 3
E. n + 4
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Re: Henry and Eleanor are waiting in line for a movie. If Henry
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23 Apr 2020, 12:43
23 Apr 2020, 12:43
Carcass wrote:
Henry and Eleanor are waiting in line for a movie. If Henry is fourth in line, and there are n people ahead of Eleanor, where n > 4, how many people are between Henry and Eleanor?
A. n - 5
B. n - 4
C. n - 3
D. n + 3
E. n + 4
A. n - 5
B. n - 4
C. n - 3
D. n + 3
E. n + 4
We call this a Variables In The Answer Choices (VIAC) question.
This question type can be solved algebraically or solved using the INPUT-OUTPUT approach where we test values.
Let's use the INPUT-OUTPUT approach.
Let's say n = 9, which means there are 9 people ahead of Eleanor.
We got the following: _ _ _ H _ _ _ _ _ E
In this case, there are 5 people between Henry and Eleanor.
In other words, when we INPUT n = 9, the answer to our question (i.e., the OUTPUT) is 5
Now we'll check the answer choices to see which one yields an output of 5 when we input n = 9.
A. 9 - 5 = 4. No good. We want an output of 5.
B. 9 - 4 = 5. PERFECT!
C. 9 - 3 = 6. No good. We want an output of 5.
D. 9 + 3 = 12. No good. We want an output of 5.
E. 9 + 4 = 13. No good. We want an output of 5.
Answer: B
Cheers,
Brent
gmatclubot
Re: Henry and Eleanor are waiting in line for a movie. If Henry [#permalink]
23 Apr 2020, 12:43
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