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A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the plat

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A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the platform.
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Volume of Platform=Volume of Well
`lbh=pir^2h`
`22*14*h=22/7*(7/2)^2*20`
`h=5/2m.`
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