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# What is the greatest common factor of positive integers x

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SVP
Joined: 21 Jul 2006
Posts: 1512

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What is the greatest common factor of positive integers x [#permalink]

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26 Nov 2007, 07:31
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 1052 [0], given: 1

Retired Moderator
Joined: 05 Jul 2006
Posts: 1749

Kudos [?]: 444 [0], given: 49

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26 Nov 2007, 08:13
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

Kudos [?]: 444 [0], given: 49

SVP
Joined: 21 Jul 2006
Posts: 1512

Kudos [?]: 1052 [0], given: 1

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26 Nov 2007, 09:11
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.

Kudos [?]: 1052 [0], given: 1

VP
Joined: 09 Jul 2007
Posts: 1098

Kudos [?]: 144 [0], given: 0

Location: London

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26 Nov 2007, 09:58
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

i think the greatest common factor of x and y is 10. A yezz has already proved it.

Kudos [?]: 144 [0], given: 0

Re: Greatest Common Factor   [#permalink] 26 Nov 2007, 09:58
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