There are several important information's already given in the question. Based on those given information's the answer can be easily deduced.
Ratio of the radii of two spheres = 9 : 2 then Ratio of the volume of the two spheres = 9^3 : 2^3 = 729 : 8 I hope that this is the answer that you were looking for and the answer has actually come to your desired help.
