GMAT Quant

This looks like something where we ought to be able to square the second equation as it stands–but that will give you a polynomial with a root in the middle. Bad. However, if you look at the left equation as a difference of squares (where the right equation is one of the two brackets), then … Read More

The function f is defined for each positive three-digit integer n by , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that then ? (A) 8(B) 9(C) 18(D) 20(E) 80 The real trick here is to think about f(m) … Read More