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?\nOptions:\n(A)  11\n(B)  15 3/4\n(C)  21\n(D)  23\n(E)  25 3/10 Stream of consciousness:
User
K + 2K +3 + 4K - 4 + 5K +1 = 12K\n(12K)/4 = 63\n12K = 63 * 4 = 252\nK = 252 / 12 = 21
Thus, the answer is (C).
Assistant