The solid sphere of radius 4 cm melted and then cast into smaller spherical balls of diameter 0.8 cm each. Find the number of these balls.
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Radius of larger sphere=4cm
Radius of smaller sphere=(0.8/2)cm=0.4cm
∴Number of smaller spheres that were made from the larger sphere=
{(4/3)×\piπ (4)³}÷{(4/3)×\piπ (0.4)³}
=1000
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