question_answer

The volumes of two spheres are in the ratio 64 :27. Find the difference of their surface areas, if the sum of their radii is 7 units.

A) \[28\pi \,\text{sq}\text{.units}\]           

B)   \[64\pi \,\text{sq}\text{.units}\]                       

C)   \[88\,\pi \,\text{sq}\text{.units}\]         

D)   \[4\,\pi \,\text{sq}\text{.units}\]