If a, b, c, and d are positive integers, is (a/b) (c/d) > c/b?
(1) c > b
(2) a > d
answer B
please help. thx.
(1) c > b
(2) a > d
answer B
please help. thx.
let's beat GMAT.
(a/b)*(c/d)=(a/d)*(c/b)
so we are comparing (a/d)*(c/b) to c/b
(a/d)*(c/b)>c/b
if all the terms are positive, x*a>a if x>1, so we need to know if (a/d)>1.
1. does not say anything about a/d
2. a>d, both terms positive, this means a/d>1, which solves the problem.
Therefore, answer - B. only second statement.
