Q. 694.3( 6 Votes )
The volumes of th A. 
B. 
C. 
D. 
Answer :
Volume of a sphere 
Given Ratio of volumes of two spheres 
So, r = 4x and R = 3x
Also given that the sum of radii = 7
⇒ r +R = 4x +3x =7x =7
⇒ x =1
So r = 4cm and R = 3cm
Surface area of a sphere 
Difference in total surface area = 
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