Revision as of 16:23, 1 February 2009 by Ernie(talk | contribs)(New page: 16. For how many integers <math>n</math> is <math>\frac{n}{20-n}</math> the square of an integer? <math>\textbf{(A) } 1\qquad \textbf{(B) } 2\qquad \textbf{(C) } 3\qquad \textbf{(D) } 4\q...)