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If xy represents a positive two-digit number, where x and y [#permalink]

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15 Apr 2013, 16:25

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Difficulty:

35% (medium)

Question Stats:

66% (01:45) correct
34% (00:54) wrong based on 230 sessions

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If xy represents a positive two-digit number, where x and y are single digit integers, which of the following CANNOT be true?

A. x + y = 9 B. xy = 9 C. x – y = 9 D. y – x = 9 E. x/y = 9

Here is a problem from a practice test. Can someone explain how the test taker is supposed to know that "If xy represents a positive two-digit number" does NOT mean that X times Y represents a positive two-digit number? Ex. The questions means that 5 &4 means 54 not 5x4=20. This is an easy question once you get passed this but I was tricked and thought it meant multiplication which led me down the wrong road. I know even with my misunderstanding of the given that you can come up with the answer anyway, but I know there is an issue with my understand of the wording and I hope to not make careless mistakes like this again. If someone could shed some light on this issue it would be much appreciated!!!!!!! Is it represents vs. equals?

If xy represents a positive two-digit number, where x and y are single digit integers, which of the following CANNOT be true?

A. x + y = 9 B. xy = 9 C. x – y = 9 D. y – x = 9 E. x/y = 9

Here is a problem from a practice test. Can someone explain how the test taker is supposed to know that "If xy represents a positive two-digit number" does NOT mean that X times Y represents a positive two-digit number? Ex. The questions means that 5 &4 means 54 not 5x4=20. This is an easy question once you get passed this but I was tricked and thought it meant multiplication which led me down the wrong road. I know even with my misunderstanding of the given that you can come up with the answer anyway, but I know there is an issue with my understand of the wording and I hope to not make careless mistakes like this again. If someone could shed some light on this issue it would be much appreciated!!!!!!! Is it represents vs. equals?

I agree that it could have been written in a better way, though represents and digit should push to the right direction.
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Re: If xy represents a positive two-digit number, where x and y [#permalink]

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07 May 2013, 23:04

MzJavert wrote:

I'm not sure what I'm missing. Wouldn't both C and D be correct?

The text is not clear, however D is wrong because y – x = 9 is possible only if 9-0=9 so y=9 and x=0 and the number would be 09, which is a ONE digit number.

I think this is what the text meant
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It is beyond a doubt that all our knowledge that begins with experience.

Re: If xy represents a positive two-digit number, where x and y [#permalink]

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08 May 2013, 08:49

Zarrolou wrote:

MzJavert wrote:

I'm not sure what I'm missing. Wouldn't both C and D be correct?

The text is not clear, however D is wrong because y – x = 9 is possible only if 9-0=9 so y=9 and x=0 and the number would be 09, which is a ONE digit number.

I think this is what the text meant

Thank you...it seems so obvious now.
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