If 15% of A is the same as 20% of B, then A : B is :  Pick:  A) 3 : 4  B) 4 : 3  C) 17 : 16  D) 16 : 17  E) none of these

Rationale: "expl : 15 % of a i = 20 % of b = 15 a / 100 = 20 b / 100 = 4 / 3 = 4 : 3 answer : b"
Answer: B