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A 40 m deep well with radius 3.5 m is dug and the earth taken out is evenly spread to form a platform of dimension 28 m by 22 m. find the height of the platform

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the volume of the well is ... π r^2 h ... π * 3.5^2 * 40

the volume of the platform is ... L * W * H ...28 * 22 * H

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