Question

A well of diameter 4m is dug 21m deep. The earth taken out is spread evenly all around it in shape of a circular ring of width 3m to form an enbankment. Find the height of the embankment.

Answer 1

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Answer 2

volume of well 84pie

volume of embankment pie h 21

volume of embank = volume of well

21h =84

=>h =4m