GRE Exam Numerical Ability Number System

A positive integer is called "square-Free" if it has no factor that is the square of an integer greater than 1. If n is an even square-free integer, which of the following must also be square free?

A. n/2
B. 2n
C. n+2
D. n²

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GRE Other Question

If Tony goes y miles in x hours, how many miles does he go per minute, in terms of x and y?
A. 60x/y B. y/60x C. 60y/x D. x/60y E. 60xy Jane can paint the wall in J hours, and Bill can paint the same wall in B hours. They begin at noon together. If J and B are both even numbers is J=B?

(1) Jane and Bill finish at 4:48 p.m.
(2) (J+B)^2=400