Civil Services UPSC EPFO (EO/AO) Mock Test 2023 Quantitative Aptitude Mensuration Solid Figures

A solid metallic sphere of radius 21 cm is melted and then drawn into N solid cones each of radius 7 cm and height 4 cm. There is no wastage of material in this process. What is the value of N?

1
169
2
189
3
279
4
108
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