Question

How many balls of radius 1 cm can be made from a sphere of radius 10 cm?

Answer 1

volume of sphere of radius $10cm=\frac{4}{3}\pi \times {10}^3$

volume of sphere of radius $1cm=\frac{4}{3}\pi \times 1^3$

no of balls $=\frac{\text{volume of sphere of radius 10 cm}}{\text{volume of sphere of radius 1 cm}}=\frac{\frac{4}{3}\pi \times {10}^3}{\frac{4}{3}\pi \times 1^3}=1000$