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The Lazy Gardener Puzzle - Solution

(Read the Lazy Gardener Puzzle)

The energetic gardener would be able to mow the lawn in twelve days. In eight days he would be able to mow 8/12 of the lawn.

This leaves 4/12 of the lawn left for the lazy gardener to mow. He takes the full eight days to do this so he mows only half as quickly as the energetic one.

He would therefore need 24 days to mow the lawn on his own.

Twice as long as the energetic one.