Question 74
If the volume of a sphere is divided by its surface area, the result is 27 cm. Find the radius of the sphere
Solution
Let say ,radius of sphere= r.
According to question,
$$\frac{\frac{4}{3}\pi\ r^3}{4\pi\ r^2}=27.$$
or,$$r=27\times3=81.$$
A is correct choice.
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