Question

If the volume of a sphere is numerically equal to its surface area, then radius of the sphere is (A) 1 unit (B) 3 units (C) 2 units (D) 6 units

Answer 1

according to the question,
volume of sphere =surface area of sphere
As we know,

surface area of sphere = 4pi *radius^2
volume of sphere= 4pi*radius^3


4pi*radius^2= 4pi*radius^3
radius= 3units