There are 9 balls that are identical. Only one ball is heavier than the rest. You also have a two-armed scale with which to measure the weight of the balls. How can you find the heavier ball by using the scale only twice?

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## Two Men Two Fishes

Two men catch two fishes in 2 minutes. At this rate, how many men are needed to catch 500 fishes in 500 minutes?

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