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Question -

How many cubic metres of earth must be dugout to sink a well 21 m deep and 6 m diameter? Find the cost of plastering the inner surface of the well at ₹9.50 per m2.



Answer -

Diameter of a well = 6 m
Radius (r) = 6/2 = 3 m
Depth (h) = 21 m
Volume of earth dugout =πr2h

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