A person has one lion, one sheep and a bundle of grass. He wants to cross a river but there is only one boat and it can’t sustain the weight of more than two articles at time.
Also, he has to make sure that the lion doesn’t eat the sheep and the sheep doesn’t eat the grass. How will he get to the other side of the river with all three intact?
Answer
First, take the sheep across, come back and then take the bundle of grass.
Since the sheep will eat the grass if left unattended, take the sheep back across and then take the lion across. Then take the sheep back across and they are all unharmed.