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 ___.

The volume of two spheres are in the ratio 64 : 27. The difference of

1.	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.	\[28\pi \,sq.\,\]units
B.	88 sq. units
C.	\[88\pi \,sq.\] units
D.	\[4\pi \,sq.\] units
Answer» B. 88 sq. units

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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 ___.

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