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For integers x and y , ifx=y/6+1 , is xy even? 1.(y+1)/5=x [#permalink] New post 27 Dec 2009, 06:48
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For integers x and y , ifx=y/6+1 , is xy even?
1.(y+1)/5=x
2. y/x is not odd.....
x=y/6+1... y=(6x-6)....so y = 0 or any multiple of 6
i think this itself is efficient.....
what does one do with the two statements, they don't mean anything as xy is even w/o even considering them
its a q from gmat club tests
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Re: gmat club test [#permalink] New post 27 Dec 2009, 13:21
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Hmm, you are right. According to the constraint from the question, y must be divisible by 6, so y must be even, and xy must be even. GMAT questions are designed to always require more info than that given in the question. I'll ask one of the GMAT Club gurus to look into this.

(Side note: you said "y = 0 or any multiple of 6," but that's redundant. Zero actually is a multiple of 6 itself, because 0/6 = 0= integer.)
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Re: gmat club test [#permalink] New post 12 Jan 2010, 08:07
We've updated the question stem (m06-29) to this one:

For integers x and y , if x = \frac{y}{5} + 2 , is xy even?

1. 5x - 10 is even
2. \frac{y}{x} is even

It should still be D. Please tell me if this one is OK.

Thank you guys for spotting the problem! +1
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Re: gmat club test [#permalink] New post 12 Jan 2010, 09:26
hi, u r absolutely correct
the ans wud be D...
each statement wud give us y as even, making xy even
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Re: gmat club test [#permalink] New post 12 Jan 2010, 09:35
Thank you once again!
chetan2u wrote:
hi, u r absolutely correct
the ans wud be D...
each statement wud give us y as even, making xy even

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Re: gmat club test   [#permalink] 12 Jan 2010, 09:35
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