Volume of a sphere = (4/3)πr³

Volume of a cylinder = πr²h

Given, cylindrical rod whose height is 8 times of its radius is melted and recast into spherical balls of same radius.

Let the number of such balls be ‘a’.

⇒ π × r² × 8r = a × (4/3)π × r³

⇒ a = 6