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Volume of a sphere = (4/3)πr3

Volume of a cylinder = πr2h

Given, radius of the internal and external surfaces of a hollow spherical shell are 3 cm and 5 cm respectively. It is melted and recast into a solid cylinder of height cm.

Volume of material = Volume of the solid cylinder

r2 = 49

r = 7 cm

Diameter = 14 cm

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