Question

Find

How much steel was actually used, if `1/12` of the steel actually used was wasted in making the tank.

`["Assume "pi=22/7]`

Answer 1

Total surface area of tank = 2πr (r + h)

`=[2xx22/7xx(2.1+4.5)]m^2`

= (44 × 0.3 × 6.6) m²

= 87.12 m²

Let A m² steel sheet be actually used in making the tank.

`therefore(1-1/12)=87.12m^2`

`rArr A=(12/11xx87.12)m^2`

⇒ A = 95.04 m²

Therefore, 95.04 m² steel was used in actual while making such a tank.