A farmer must cross a river with a wolf, a goat and a cabbage. The boat holds him and one item. Left alone, the wolf eats the goat and the goat eats the cabbage. How does he do it?
Hint: Something has to come back across.
Take the goat over. Return. Take the wolf over, bring the goat back. Take the cabbage over. Return and take the goat.
The goat is the only item that conflicts with both others, so it travels first and is brought back once to keep the wolf and cabbage apart from it.
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