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M18, Q30 - Test Error? Or me?

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M18, Q30 - Test Error? Or me? [#permalink] New post 26 Oct 2009, 22:46
Is XY > X/Y

1. 0<Y<1

2. XY>1

OA
[Reveal] Spoiler:
C


My Answer, which I cant understand to be wrong
[Reveal] Spoiler:
A. XY>X/Y can be converted to Y^2>1. Statement 1 tells us that Y is a fraction and a fraction squared can never be greater than 1 (Y^2>1), so I concluded the answer "No", marking A as the correct answer. Can anybody explain what I did wrong?
1 KUDOS received
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Re: M18, Q30 - Test Error? Or me? [#permalink] New post 26 Oct 2009, 23:15
1
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dpgxxx wrote:
Is XY > X/Y

1. 0<Y<1

2. XY>1

OA
[Reveal] Spoiler:
C


My Answer, which I cant understand to be wrong
[Reveal] Spoiler:
A. XY>X/Y can be converted to Y^2>1. Statement 1 tells us that Y is a fraction and a fraction squared can never be greater than 1 (Y^2>1), so I concluded the answer "No", marking A as the correct answer. Can anybody explain what I did wrong?


XY>X/Y cannot be converted to Y^2>1. In an inequality, unless you know the sign -- in this case, of x, you cannot cancel the x on both sides.

In this case: if x>0
Y^2 > 1.

But if, x<0
then, Y^2 < 1.
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Re: M18, Q30 - Test Error? Or me? [#permalink] New post 27 Oct 2009, 01:21
I can't believe I never considered that. Thank you so much! Kudos +1
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Re: M18, Q30 - Test Error? Or me? [#permalink] New post 27 Oct 2009, 02:05
Welcome to GMAT Club tests :lol:

Would recommend you print this out and save in your error log or folder you keep for all similar types of issues.
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Re: M18, Q30 - Test Error? Or me?   [#permalink] 27 Oct 2009, 02:05
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