Question

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

Answer 1

Step-by-step explanation:

Given, a closed cylindrical petrol tank.

The diameter of the tank =

Height of the tank =

Now, Total surface area of the tank =

Now, let

of steel sheet be actually used in making the tank

Since

of steel was wasted, the left

of the total steel sheet was used to made the tank.

The total surface area of the tank =

Therefore,

of steel was actually used in making the tank.

Answer 2

Answer:

actual used steel =

$1 - wasted \: part = \\ 1 - \frac{1}{12} = \\ \frac{11}{12} \: \: part \: used.$