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If xy represents a positive two-digit number, where x and y [#permalink]
15 Apr 2013, 15:25

00:00

A

B

C

D

E

Difficulty:

25% (medium)

Question Stats:

68% (01:47) correct
32% (00:54) wrong based on 198 sessions

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?

Re: If xy represents a positive two-digit number, where x and y [#permalink]
15 Apr 2013, 15:42

Expert's post

Richard0715 wrote:

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. _________________

Re: If xy represents a positive two-digit number, where x and y [#permalink]
07 May 2013, 22:04

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 _________________

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]
08 May 2013, 07:49

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. _________________