This is an old one but surprisingly, many peoples still don't know the answer. There is a river. On one end is a man, a wolf, a goat and a cabbage. There is a boat which has to be used to cross the river. However, the man can take only one thing with him at one time. Now if the goat and the cabbage is left behind, the goat will eat it and if the goat and wolf are left behind, the wolf will eat the goat.
How will he cross the river with the two animals and the cabbage?
Solution:
You can solve this question with two different methods. However, we are just providing one of them. If you can think of the other solution then it's great.
The man will take the goat with him and will leave the wolf and cabbage. Then he will return back leaving the goat on the other end. Now he will take the cabbage and will row towards the other end. He will leave the cabbage there and bring goat back along with him. Then he will take the wolf and leave the goat there. After leaving the wolf with cabbage on the other end, he will return back and will take the goat with him to the other end.