Imagine Johnny, a party clown, is carrying three pieces of gold each piece weighing one kilogram. While taking a walk he comes to a bridge which has a sign posted saying the bridge could hold only a maximum of 80 kilograms. John weighs 78 kilograms and the gold weighs three kilograms. Johnny reads the sign and still safely crossed the bridge with all the gold. How did he manage this?
Johnny is a clown so he has mastered juggling. When he came to the bridge he juggled the gold, always keeping one piece in the air.