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Puzzle ZWFI 



??

If 5 cats can catch 5 rats in 5 minutes...

...how many cats do you need to catch 100 rats in 100 minutes?

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Answer
5.

  5 cats can catch 5 rats in 5 minutes.

So

  1 cat can catch 1 rat in 5 minutes.

  1 cat can catch 2 rats in 10 minutes.

  1 cat can catch 20 rats in 100 minutes.

Therefore

  5 cats can catch 100 rats in 100 minutes.

 

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