The radius of a spherical ballon increases from 21 cm to 35 cm as air is being pumped into it. Find the ratio of the surface area of the ballon in the two cases.
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first find volume of sphere with having a radius of 21
and then find vol. of sphere having radius 35
and put the respective volumes into ratio(X: Y)
and then find vol. of sphere having radius 35
and put the respective volumes into ratio(X: Y)
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