A well of diameter 7 m is dug 20 m deep and the earth taken out is spread evenly over a field 55 m long and 28 m wide. Taking π = 22/7, by how many centimetres is the level of the field raised?
Correct answer B. 50 cm
Explanation
Earth = 22/7 x 3.5 x 3.5 x 20 = 770 cu m. Field area = 55 x 28 = 1540 sq m. Rise = 770 / 1540 = 0.5 m = 50 cm.
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