A solid metallic sphere of radius 21 cm is melted and recast

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A solid metallic sphere of radius 21 cm is melted and recast into a cone with diameter of the base as 21 cm. What is the height (in cm) of the cone?

[SSC CPO 3 July 2017 Morning Shift With Answers]

A 336

B 112,

C 224,

D 66,