Question

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

Answer 1

$\begin{array}{c}Volumeof1cmradiusball=\frac{4}{3}\pi {\left(1\right)}^3\\ \Rightarrow Volumeof8cmradiusball=\frac{4}{3}\pi {\left(8\right)}^3\\ \Rightarrow Thennumberofballs=\frac{\frac{4}{3}\pi \times 8\times 8\times 8}{\frac{4}{3}\pi \times 1\times 1\times 1}=512\end{array}$