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If four kittens can catch four mice in four minutes, how many mice can twelve kittens catch in twelve minutes?

 [Ref: ZLCG] © Kevin Stone

36.

   Four kittens can catch four mice in four minutes,

so

   one kitten can catch one mouse in four minutes,

so

   one kitten can catch three mice in twelve minutes,

so

   twelve kittens can catch 36 mice in twelve minutes.

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