Question

A well with an internal diameter of 12 m is dug 15 m deep . The earth taken out of it is spread all around width of 3 m to form a embankment. Find the height of the embankment

Answer 1

given; ,r=6m, h=15m, w=3m R=9m let eight of embankment be H
volume of well=volume of embankment
$\pi r^{2} h= \pi ( R^{2} - r^{2} )H$
22/7*6*6*15=22/7*(9*9-6*6)H
36*15=45*H
12=H
therefore height of embankment is 12m