A solid sphere of radius 6 cm is melted

MATHEMATICS · Single correct · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes

Problem

A solid sphere of radius 6 cm is melted. One-half of the metal is used to make 4 identical small spheres of radius 3 cm each, and the remaining metal is cast into a right circular cylinder of height 9 cm. What is the radius of this cylinder? (a) 6 cm6\,\text{cm} (b) 5 cm5\,\text{cm} (c) 4 cm4\,\text{cm} (d) 3 cm3\,\text{cm}

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