A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a plat form of dimension 28m by 22m. Find the height of the platform.
divide the volume by the base area to get
(40*pi*3.5^2)/(28*22) = 35/44 pi or 2.5
(40*pi*3.5^2)/(28*22) = 35/44 pi or 2.5