Question

The rainwater which falls on the roof 18m long and 16.5 wide is stored in a cylindrical tank of radius 4 m. If it rains 10 cm on a day, what is the rise in the water level in the tank due to it.

Answer 1

let h be the height of water in the tank after the rain water is collected.
so
vol of water on the roof = vol of water in tank
vol of water on the roof=18 X 16.5 X 0.1 cu meter
vol of water in the tank =3.14 X 4 X 4 X h
so, ATQ
18 X 16.5 X 0.1=3.14 X16 X h
Solve and get the value of h.