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# gmat club test

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Verbal Forum Moderator
Joined: 02 Aug 2009
Posts: 3967
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Kudos [?]: 2628 [1] , given: 97

For integers x and y , ifx=y/6+1 , is xy even? 1.(y+1)/5=x [#permalink]

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27 Dec 2009, 07:48
1
KUDOS
Expert's post
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Manhattan GMAT Instructor
Joined: 28 Aug 2009
Posts: 153
Location: St. Louis, MO
Schools: Cornell (Bach. of Sci.), UCLA Anderson (MBA)
Followers: 176

Kudos [?]: 382 [1] , given: 6

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27 Dec 2009, 14:21
1
KUDOS
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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Emily Sledge | Manhattan GMAT Instructor | St. Louis

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CIO
Joined: 02 Oct 2007
Posts: 1218
Followers: 95

Kudos [?]: 875 [0], given: 334

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12 Jan 2010, 09:07
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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Verbal Forum Moderator
Joined: 02 Aug 2009
Posts: 3967
Followers: 246

Kudos [?]: 2628 [0], given: 97

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12 Jan 2010, 10:26
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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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

CIO
Joined: 02 Oct 2007
Posts: 1218
Followers: 95

Kudos [?]: 875 [0], given: 334

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12 Jan 2010, 10:35
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, 10:35
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