Question

a well 20 m in diameter is dug 18 m deep and earth taken out is spread all around it to a width of 5 m to form an embankment.
What is the height of the embankment.
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Answer 1

Answer: 14.4

Step-by-step explanation:

let the radius of the well be r=20/2 m

Height h =18m

Volume of earth dug out = pi×10*10*18

Volume of earth dug out = Volume of the embankment

So we get

Pi*R2H-pi*r2h

By substituting and solving we get h=14.4