A solid sphere of radius 9 cm is melted to form a sphere of

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A solid sphere of radius 9 cm is melted to form a sphere of radius 6 cm and a right circular cylinder of same radius. The height of the cylinder so formed is ?

[2016 SSC CGL10 Sep Tier-1]

A 19 cm

B 21 cm

C 23 cm

D 25 cm