5 Cats

If 5 cats can catch 5 mice in 5 minutes, how many cats do you need to catch 100 mice in 100 minutes?

Answer

5 cats. The same five could keep catching 5 mice every 5 minutes for 100 minutes.

Alternatively:
1 cat can catch 1 mice in 5 minutes.
1 cat can catch 20 (1×20) mice in 100 (5×20) minutes.

Therefore, 5 cats can catch 100 mice in 100 minutes.

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