The volume of two spheres are in the ratio 64 : 27. The difference of their surface areas, if the sum of their radii is 7 units, is _____.
A 28 π sq. units
B 88 sq. units
C 88π sq. units
D 4π sq. units
*88sq units = 28 pi sq units since 28*22/7 = 22*4 = 88 sq units .. the answer should be corrected , A > or B> is correct for this question