What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse?

Let us assume the number of bulbs be y.

Power of y bulbs, P=60y

V=220V, I=5A

We know that

P = VI

60y = 220 x 5

60y = 1100


So, number of bulbs required are 18.