A well of diameter 3m is dug 14 m deep. The earth taken out of it has been spread evenly all around it in the shape of a circular ring of width 4m to form an embankment. Find the height of the embankment.

Explanation

Volume of embankment=Volume of earth dig out

`h(pi(r+4)^2-pir^2)=pir^2h`

`h=(r^2h)/((r+h)^2-r)`

`h=((3/2)^2 14)/(((3/2)+4)^2-3/2)`

h=1.125m