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 750?\nOptions:\n(A) 10\n(B) 11\n(C) 12\n(D) 13\n(E) 15 Now, let's think a bit. Some random thoughts:
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750 = 3*222 + (22*3) + 9*2\nK weight of 600 = 3 +3+9 = 15
The final answer: (E).
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