how many cubic metres od of earth must be dug out to sink a well 22.5 m deep and diameter 7 m? also find the cost of plastering its inner curved surface at ₹3 per square metres.
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Step-by-step explanation:
volume of earth to be dug-out = volume of the well
7
22
×
2
7
×
2
7
×22.5m
3
= 866.25m
3
area of the inner curved surface
=2πrh
=2×
7
22
×
2
7
×22.5m
2
=495
The cost of plastering the inner curved surface
=495×3=Rs1485
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