27 Snakes in Four Cages

A zookeeper has to put 27 snakes in four cages. His problem is that he must have an odd number of snakes in each cage. How can he accomplish this? You can put any number of snakes in a cage as long as the total number of snakes in each cage is an odd number.

Answer

Put nine snakes in each of three cages, and put those three cages within a fourth, larger cage.

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