Brain Teasers and Puzzles

A box for your workings out:

Hint: How many mice can one kitten catch in twelve minutes?

Answer: 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.