GMAT Prep (Mutiples) Pract2

[dferm]

Is the integer n a multiple of 15?

(1) n is a multilple of 20
(2) n+6 is a multiple of 3

Please assist...

Thanks...

[aatech]

1 - not suff

n=6, so n+6= 12 => multiple of 3 but "n" is not multiple of 15
n=45, so n+6=51 => "n+6" multiple of 3 and "n" multiple of 15

2 - not suff

n is multiple of 20 => means n is multiple of 5
n+6 is multiple of 3 means n is multiple of 3

together "n" is multiple of 15