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  • How many cubic m of soil must be dug to make a well 20 m deep and 2m in diameter . If the curved surface of the well is to be plastered at a rate of Rs. 50/meter square , find the cost of plastering?

How many cubic m of soil must be dug to make a well 20 m deep and 2m in diameter . If the curved surface of the well is to be plastered at a rate of Rs. 50/meter square , find the cost of plastering?

Answers (1)

$ Height of the well (h) = 20 m \\ Diameter of the well = 2 m $ \Rightarrow radius (r) = 1 m\\ $ Volume of the well $ = \pi r^2h \\ = \frac{22}{7}(1)^2 (20) = 62.8 m^3 \\ $ 62.8 cubic meter of soil must be dug to make this well \\ Curved surface of the well = $ 2 \pi r h \\ = 2 \times 3.14 \times 1 \times 20 \\ = 125.6 m^2\\ $ Total cost the cost of plastering = $ 50 \times 125.6 = Rs \ 6280

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shubham.krishnan

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