If you open math book you will find a lot of mathematical questions but
you should have solve this question.
It is from class 10 rd sharma chapter 16 mensuration .
In this question we have to find the diameter of the third ball
given that a spherical ball of radius 3 cm is melted and
recast into three spherical balls.The radii of two of the
balls are 1.5 cm and 2 cm.