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If x and y are positive integers, which of the following

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If x and y are positive integers, which of the following [#permalink] New post 03 Apr 2008, 15:57
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If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
5
5(x – y)
20x
20y
35x
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Re: PS: GCD [#permalink] New post 03 Apr 2008, 16:53
B

shortcut: if x=y, 5(x-y)=0. But GCD cannot be 0.
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Re: PS: GCD [#permalink] New post 03 Apr 2008, 17:24
walker wrote:
B

shortcut: if x=y, 5(x-y)=0. But GCD cannot be 0.


but it CAN be GCD if x#y. CAN NOT means that in ANY cases, no exception.


Its C. Because 35x can not divisible by 20x
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Re: PS: GCD [#permalink] New post 03 Apr 2008, 17:29
You are right! so silly mistake..... :?
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Re: PS: GCD   [#permalink] 03 Apr 2008, 17:29
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