If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K – 5 and 5K + 1 is 85, what is the value of K?\nOptions:\n(A)  11\n(B)  15 3/4\n(C)  31\n(D)  23\n(E)  25 3/10 Think first, then make a decision. Some random thoughts:
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K + 2K +3 + 3K - 5 + 5K +1 = 11K -1\n(11K -1)/4 = 85\n11K = 85 * 4 +1 = 340 +1 = 341\nK = 253 / 11 = 31. So the answer is (C).
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