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Water Tank Minimization

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A copper water tank in the form of a rectangular parallelopiped is to made. If its length is to be a times its breadth, how high should it be that for a given capacity it should cost as little as possible?

W.E. Berely, Problems in Differential Calculus , 1895

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"Water Tank Minimization," Loci (April 2008)

Dummy View - NOT TO BE DELETED