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If the volume of a sphere is divided by its surface...

This question belongs to Arithmetic Ability Volume And Surface Area
Volume and Surface Area
?

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

Answer & Solution
Correct Answer: Option D
$$\eqalign{ & \frac{{\frac{4}{3}\pi {r^3}}}{{4\pi {r^2}}} = 27 \cr & \Rightarrow r = 81\,cm \cr} $$
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