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Didn't get it. Would appreciate your explanations

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Didn't get it. Would appreciate your explanations [#permalink] New post 28 Apr 2007, 07:57
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Didn't get it. Would appreciate your explanations
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 [#permalink] New post 28 Apr 2007, 10:10
EDIT: Sorry, my bad. The correct solution should be

x=8y + 12

From (2), y=12z => x = 8(12z) + 12 = 12(8z+1)

But 12z and 8z+1 can not have a common factor since one is a multiple of z, but the other is one more than a multiple of z

So, B is correct.

Last edited by mNeo on 28 Apr 2007, 11:20, edited 2 times in total.
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 [#permalink] New post 28 Apr 2007, 11:19
You are right. Damn, I suck at Maths too :oops: I fixed my answer
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 [#permalink] New post 29 Apr 2007, 09:44
I think I got it know...

B is the answer


Stmt 1)
x=12u
y=3/2 * (u-1)

we try different values for u:
u=3 y=3 and x=36 -> GCF = 3
u=5 y=6 and x=60 -> GCF = 6
--> Insuff

Stmt 2)
y=12z
x=12*(8z+1)

y and x are both multiple of 12, so their GCF is 12 --> Suff
  [#permalink] 29 Apr 2007, 09:44
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