A 20m deep well with diameter 7 is dug and the earth from digging is evenly spread out to from a platform 22m by 14m.find the height of the platform
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Diameter = 7cm
So radius =d/2
= 3.5 cm
Earth dug out from ( cylindrical ) well
= pie x r x e x h
= 22/7 x 3.5 x 3.5 x 20
= 770 m^3
to form platform ( cuboidal)
volume of a cuboid = l x b x h
770 = 22 x 14 x h
so height = 770/ 20 x 14
= 2.5 m
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