Question

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

Answer 1

Let the number of balls be n.

So, volume of solid sphere = n $\times$ volume of each ball

$\Rightarrow \frac{4\pi }{3}\times 8\times 8\times 8=n\times \frac{4\pi }{3}\times 1\times 1\times 1$

$\therefore n=512$