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Question

# A well of diameter 14m is dug 8m deep. The earth taken out of it is evenly spread all around it to a width of 21 m to form an embankment. Find the height of the embankment( in cm).

A

48.2

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B

53.3

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C

50

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D

57.5

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Solution

## The correct option is B 53.3 Volume of earth dug out from the well = πr2h=227×7×7×8=1232m3 Area of the embankment = 227×(R2−r2)=227×((28)2−(7)2)m2=227×35×21=2310m2 . Height of the embankment = Volume of earth dug outarea of embankment = 12322310×100cm = 53.3 cm

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