A well of diameter 7cm is dug 22.5m deep.The earth taken out it is spread evently all around it to a width of 10.5 to from an embankment .find the height of the embankment.

Answer 1

that's some skinny well!

v = pi r^2 h = pi(3.5)^2 (2250) = 86590 cm^3

If the embankment is 10.5 cm wide, starting at the edge of the well (complete description of the problem is important!)

86590 = pi (17.5^2 - 7^2)h
so, h = 107 cm