Steve, a party magician, is carrying three pieces of gold each piece weighing one kilogram.

On the way to a session he comes to a bridge which has a sign posted saying the bridge could hold only a maximum of 80 kilograms.

Steve weighs 78 kilograms and the gold weighs three kilograms.

He reads the sign and still safely crossed the bridge with all the gold.

How did he manage this?

answer:

Steve is a juggler. When he came to the bridge he juggled the gold, always keeping one piece in the air.