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A 16m deep well with diameter 3.5m is dug up and the earth from it is spread evenly to form a platform 27.5m by 7m. Find height of platform?

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Let as assume well is a solid right circular cylinder

Radius of cylinder (r)=3.5/2 = 1.75m

Height (or) depth of well = 16m.

Given that length of platform (l) = 27.5m

Breath of platform (b) = 7 cm 

Let height of platform be x m

Since well is spread evenly to form platform

So equating (1) and (2)

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