The diameter of a sphere is twice the diameter of another sphere The curved surface area of the firs...........

Quantitative Aptitude (CGL) Mensuration 3D

The diameter of a sphere is twice the diameter of another sphere. The curved surface area of the first and the volume of the second are numerically equal. The numerical value of the radius of the first sphere is

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Explanation:

Let the diameter of first sphere is d and diameter of second sphere is D.
d=2D;
π * d² = 1/3 * π* (D)³;
put value of d in the above equation-
4D² = 1/3 *(D³); => D = 12 cms;
d=2*12 = 24 cms.