The average of five results is 48 and that of the first four is 45. The fifth result is?\nOptions:\n(A) 50\n(B) 60\n(C) 70\n(D) 80\n(E) 90 Hmmm, my stream of consciousness:
User
5 * 48 – 4 * 45 = 60 So, the answer is (B).
Assistant