Question

how much money has to be paid of labours by the village authorities for digging a well of radius 3.5 m and height 10 m at the rate of rs 30 per m.

Answer 1

volume of well = πr²h
= 22/7×(3.5×3.5)10
= 182.5 m³
cost = 30×182.5
= 5469 RS ans.