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The diameters of internal and external surfaces of hollow spherical shell are 10cm and 6cm respectively. If it is melted and recast into a solid cylinder of length of  8/3cm, find the diameter of the cylinder.

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Given diameter of internal surfaces of a hollow spherical shell  = 10cm

Radius (r) = 10/2 = 5cm

External radii (R) = 6/2 = 3cm

Given length of solid cylinder (h) =8/3 cm

Let radius of solid cylinder be ' r '

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