The radius of the base and height of a metallic solid cylinder are r cm and 6 cm respectively. It is melted and recast into a solid cone of the same radius of base. The height of the cone is :
Options:
A . 9 cm
B . 18 cm
C . 27 cm
D . 54 cm
Answer: Option B Let the height of the cone be h cm Then, $$\eqalign{ & \pi \times {r^2} \times 6 = \frac{1}{3} \times \pi \times {r^2} \times h \cr & \Rightarrow h = 18\,cm \cr} $$
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