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What is the greatest common factor of positive integers x

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SVP
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What is the greatest common factor of positive integers x [#permalink] New post 26 Nov 2007, 06:31
What is the greatest common factor of positive integers x and y?

(1) The greatest common factor of x/2 and y/2 is 5.
(2) x and y are even


Provide explanation when choosing your answer
SVP
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 [#permalink] New post 26 Nov 2007, 07:13
What is the greatest common factor of positive integers x and y?

(1) The greatest common factor of x/2 and y/2 is 5.
(2) x and y are even

X/2 = 5K ie: x = 10k , y = 10p

insuff

from 2

insuff

both together i see insuff


my answer is E
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 [#permalink] New post 26 Nov 2007, 08:11
OA is A. But still don't see how. would anyone be able to explain how? cause i only have the answer without the explanation.

i'll appreciate it.
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Re: Greatest Common Factor [#permalink] New post 26 Nov 2007, 08:58
tarek99 wrote:
What is the greatest common factor of positive integers x and y?

(1) The greatest common factor of x/2 and y/2 is 5.
(2) x and y are even


Provide explanation when choosing your answer


i think the greatest common factor of x and y is 10. A yezz has already proved it.
Re: Greatest Common Factor   [#permalink] 26 Nov 2007, 08:58
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