Question

Find how much steel was actually used, if 1/12 of the steel actually used was wasted in making the tank.​

Answer 1

Given:h=4.5m,r=2.1m

Total surface area of tank=2πr(r+h)

=2×

7

22

×2.1×(2.1+4.5)

=2×

7

22

×2.1×6.6=87.12m

2

Let amount of steel used in making the tank x

Steel wasted=

12

x

Given that:Amount of steel required−Amount of steel wasted=TSA of tank.

⇒x−

12

x

=87.12

⇒

12

11x

=87.12

⇒x=

11

12

×87.12=95.04m

2

∴,95.04m

2

steel was used in actual while making