The River Crossing Puzzle

A farmer needs to carry a wolf, a goat, and a cabbage across a river. He has a boat that can carry him and one other item at a time. If left alone, the wolf will eat the goat, and the goat will eat the cabbage. How can he carry all three across the river without anything being eaten?

Answer:

1. Take the goat across the river first.
2. Return alone and take the cabbage across.
3. Leave the cabbage and bring the goat back.
4. Take the wolf across the river.
5. Return alone and finally take the goat across.