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if a and b are positive integers, what is the value of a +

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if a and b are positive integers, what is the value of a + [#permalink] New post 10 Sep 2006, 12:01
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if a and b are positive integers, what is the value of a + b?

1. a/b= 5/8
2. the greatest common divisor of a and b is 1.
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Re: DS- a & b [#permalink] New post 10 Sep 2006, 12:49
lan583 wrote:
if a and b are positive integers, what is the value of a + b?

1. a/b= 5/8
2. the greatest common divisor of a and b is 1.


I think the answer is C

From 1, a/b=5/8 a and b could be any 2 integers satisfying the ratio i.e. (5,8) or (10,16) etc
INSUFF

From 2, the GCD is 1 is INSUFF as a and b could be any 2 prime numbers

Combined, a=5 and b=8 are the only values possible hence a+b = 13

SUFF
Re: DS- a & b   [#permalink] 10 Sep 2006, 12:49
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