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Questionable solution to a GMAT club test problem (Math # 8)

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Questionable solution to a GMAT club test problem (Math # 8) [#permalink] New post 30 May 2009, 01:22
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I came across this problem (attached) on one of GMAT Club's quant tests (Math # 8, question # 7). I find the solution flawed because:

1. The question asked is: "what is the largest number of people who like Raspberry Jam, but do not like either Strawberry or Apple Jam.

2. However, in the solution, the equation for the answer contains a term which = people who like strawberry, raspberry and apple jam. This clearly contradicts the question. Please clarify.
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Re: Questionable solution to a GMAT club test problem (Math # 8) [#permalink] New post 30 May 2009, 07:35
snatekar wrote:
I came across this problem (attached) on one of GMAT Club's quant tests (Math # 8, question # 7). I find the solution flawed because:

1. The question asked is: "what is the largest number of people who like Raspberry Jam, but do not like either Strawberry or Apple Jam.

2. However, in the solution, the equation for the answer contains a term which = people who like strawberry, raspberry and apple jam. This clearly contradicts the question. Please clarify.




The question asks "What is the largest POSSIBLE number of people......."

In such questions, you do need to take into consideration the number of people who do not like any of the jam ("N").

Had the question asked "What is the number of people who liked Raspberry ONLY ?", question would have either specifically mentioned the value of N or ruled out the possibility of N.

Hope it helps.
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Re: Questionable solution to a GMAT club test problem (Math # 8) [#permalink] New post 30 May 2009, 10:56
Thanks for your response. I think I misquoted my question. Can you explain the term "SAR" in the final solution which implies people who like Strawberry, Apple and Raspberry Jam. Since the question asks about people who like Raspberry but not Apple or Strawberry, the presence of this term is contradictory to the question.
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Re: Questionable solution to a GMAT club test problem (Math # 8) [#permalink] New post 30 May 2009, 12:23
The question is considering the possibility of the number of people who like all the three Jams, representing it by the term SAR.
No, it is not contradictory to the what the question asks.

Try drawing a venn diagram to understand it.
Re: Questionable solution to a GMAT club test problem (Math # 8)   [#permalink] 30 May 2009, 12:23
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