Question

How many balls, each of radius $1cm$, can be made from a solid sphere of lead of radius $8cm$?

Answer 1

No. of balls $=$ $\frac{Volumeofbiggerball}{Volumeofsmallerballs}$

as the amount of lead remains constant.

$=\frac{\frac{4}{3}\pi R^3}{\frac{4}{3}\pi r^3}=\frac{8^3}{1^3}=512$