K-numbers are positive integers with only 2's as their digits. For example, 2, 22, and 222 are K-numbers. The K-weight of a number n is the minimum number of K-numbers that must be added together to equal n. For example, the K-weight of 50 is 5, because 50 = 22 + 22 + 2 + 2 + 2. What is the K-weight of 550?\nOptions:\n(A) 10\n(B) 11\n(C) 12\n(D) 13\n(E) 15 OK. Let's think. Some random thoughts first:
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550 = 2*222 + (22*4) + 9*2\nK weight of 600 = 2 +4+9 = 15 The answer: (E).
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