If the volume of a sphere is divided by its surface area, the result is 27 cm. The radius of the sphere is :

A. 9 cm

B. 36 cm

C. 54 cm

D. 81 cm

Answer: Option D

Solution(By Examveda Team)

$$\eqalign{ & \frac{{\frac{4}{3}\pi {r^3}}}{{4\pi {r^2}}} = 27 \cr & \Rightarrow r = 81\,cm \cr} $$