Question

B. How many cubic metres of earth must be dug to sink a well 24m deep having diameter of 7
metres? Also find the cost of plastering the inner curved surface at Rs. 50 per square metre.​

Answer 1

Answer:

Volume of earth to be dug = Volume of well

={22}{7} x{7}{2} x{7}{2} x {24m} = {924m}

Area of the inner curved surface

= 2πrh = 2 x{22}{7} x{7}{2} x {24m} = {528m}

Hence.. Cost of plastering the inner curved surface =R

Rs(528x3) = Rs 1584.

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