How many cubic metres of earth must be dug out to sink a well 22.5m deep and of diameter 7m . Also, find the cost of plastering the inner curved surface at Rs 3 per square metre .

Answers (1)

Solution:  We have , 

               volume of earth to be dug out = Volume of the well 

                                                               =frac227	imes frac72	imes frac72	imes 22.5 m^3=866.25m^3

                Area of the inner curved surface 

                = 2pi rh = 2	imes frac227	imes frac72	imes 22.5 m^2= 495m^2

	herefore Cost of plastering the inner curved surface = Rs (495	imes 3)=Rs1485

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