If the average (arithmetic mean) of the four numbers K, 2K + 3, 4K 4 and 5K + 1 is 63, what is the value of K?
Options:
(A) 11
(B) 15 3/4
(C) 21
(D) 23
(E) 25 3/10 Stream of consciousness first, then make a decision:
K + 2K +3 + 4K - 4 + 5K +1 = 12K
(12K)/4 = 63
12K = 63 * 4 = 252
K = 252 / 12 = 21
Thus, the answer is (C).