Question

How many balls each of radius $1cm$ can be made by melting a bigger ball whose diameter is $8cm$ ?

Answer 1

Diameter$=8$ cm

Radius of big $=4$ cm

Radius of small ball $=1$ cm

No. of small balls $=\frac{volumeofbigball}{volumeof1smallball}$

$=\frac{4}{3}\pi (4{)}^3$

$=\frac{4}{3}\pi (1{)}^3$

$=4^3$

$=64$ balls.