Question

Find the number of balls each of radius 1cm.can be made from a solid sphere of lead of 6cm.

Answer 1

Vol. of bigges sphere/ Vol. of smaller sphere
4/3*pi WILL GET CANCELLED
So we will have 6^3
=256 balls

Answer 2

$number \:of \: ball \: that \: can \: be \: made = \frac{volume \: of \: ball}{volume \: of \: solid \: sphere} \\ = \frac{ \frac{4}{3} \pi {r}^{3} }{ \frac{4}{3} \pi {(r2)}^{3} } \\ = \frac{ {r}^{3} }{ {(r2)}^{3} } \\ = \frac{6 \times 6 \times 6}{1 \times 1 \times 1 } \\ = 216 \: balls$
I hope it helps you.