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Re: value of A+B? and GCD=1 [#permalink]
09 Oct 2008, 03:19

1

This post received KUDOS

A: a/b = 5/8 so a + b = 13

a/b = 10/16 so a + b = 26

a/b = 15/24 so a + b = 39

so we get multiple values of a+ b , not suffiecient

B: GCD is 1 mean there is no common factor between A and B other than 1 , but this alon is not sufficient as there are thousand such number pair (3,7) , (5,11)...and so on

So B is also not sufficient

--- A + B : We know ratio is 5/8 and GCD is 1 means they must be 5 and 8 only (if we take 10 and 16 then ratio will remain same but GCD become 2)

So answer will be C:

Thanks Vishal Shah

gmatclubot

Re: value of A+B? and GCD=1
[#permalink]
09 Oct 2008, 03:19

I couldn’t help myself but stay impressed. young leader who can now basically speak Chinese and handle things alone (I’m Korean Canadian by the way, so...