GMAT Practice Question Set #61 (Question 181-183)

Problem Solving Question #183: Expression must be an integer
 Time 0 0 : 0 0 : 0 0
 If n and y are positive integers and 450y = n3, which of the following must be an integer?  I. y/(3*2^2*5)  II. y/(3^2*2*5)  III. y/(3*2*5^2) (A) None (B) I only (C) II only (D) III only (E) I, II, and III
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