Here’s the story:
A farmer returns from the market, where she bought a goat, a cabbage and a wolf. On the way home she must cross a river. Her boat is small and won’t fit more than one of her purchases.
As such, she cannot leave the goat alone with the cabbage (because the goat would eat it) and she can’t leave the goat alone with the wolf (because the goat would be eaten).
How can the farmer get everything on the other side?