If 13 = 13w/(1-w) ,then (w)2 =  Select:
A) 1 / 4 B) 1 / 2 C) 1 D) 2 E) 3

Rationale: 13 - 13 w = 13 w 26 w = 13 w = 1 / 2 2 w * 2 = 1 / 2 * 2 = 1 answer : c
Answer: C