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$1000$ small thermocol balls of radius $0.5$ cm are kept in a spherical
nballoon of radius $20$ cm. Find the volume of air in the balloon.
nballoon of radius $20$ cm. Find the volume of air in the balloon.
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Volume of air in the ballon = Volume of spherical balloon $-$ Volume of $1000$
nthermocol balls
$= \frac{4}{3} \times \frac{22}{7} \times (20)^3 - 1000 \times \frac{4}{3} \times \frac{22}{7} \times (0.5)^3$ (1 Mark)
$= 33000$ cm$^3$ (1 Mark)
nthermocol balls
$= \frac{4}{3} \times \frac{22}{7} \times (20)^3 - 1000 \times \frac{4}{3} \times \frac{22}{7} \times (0.5)^3$ (1 Mark)
$= 33000$ cm$^3$ (1 Mark)