Mensurationmedium · Past Paper
A metallic sphere of radius 10.5 cm is melted and then recast into small cones, each of radius 3.5 cm and height 3 cm. Find the number of cones.
A126
B21
C63
D130
✓ Correct Answer: A — 126
Vol sphere = 4/3π(10.5)³. Vol cone = 1/3π(3.5)²(3). N = [4 * (10.5)³] / [(3.5)² * 3] = [4 * 3.5³ * 3³] / [3.5² * 3] = 4 * 3.5 * 9 = 126.
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