A spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of two of these balls are 1.5 cm and 2 cm. The radius of the third ball is
Volume of a sphere 
Volume of spherical ball 
Volume of three balls 
On recasting this sphere into three spherical balls, volume will remain same
⇒ r = 2.5 cm
67