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What length of a solid cylinder 2cm in diameter must be taken to recast into a hollow cylinder of length 16cm,

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What length of a solid cylinder 2cm in diameter must be taken to recast into a hollow cylinder of length 16cm, external diameter 20cm and thickness 2.5 mm?

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Given that diameter of solid cylinder = 2cm 

Given that solid cylinder is recast to hollow cylinder 

Length of hollow cylinder =16cm 

External diameter = 20cm 

Thickness 2.5 mm = 0.25 cm

Volume of solid cylinder is equal to volume of hollow cylinder.

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