Answer :

Given, the radius of the cylindrical tube, r = 12cm


Level of water raised in tube, h = 6.75cm


Volume of cylinder = πr2 h


= π (12)2 × 6.75 cm3


----------(i)


let r be the radius of a spherical shell balls


volume of the sphere = -------(ii)


volume of cylinder = volume of spherical ball




r = 9cm


radius of spherical ball, r = 9cm


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