Four kids can wash three whiteboards in 20 minutes. How long would it take, in minutes, for one kid to wash six whiteboards?
Thoughts? Step-by-step reasoning:
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One kid can wash three whiteboards in 20 * 4 = 80 minutes. One kid can wash six whiteboards in 80 * (6 / 3) = 160 minutes.
Thus, the answer is 160.
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