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5 to 3
If the ratio of the radii is 1:3 then the ratio of volumes is 1:27.
27 : 36 9:12 3:4 is the final answer
27
number of boys = ratio of boys x total strength / total ratio = 5 x 27/9 = 5 x 3 = 15 number of girls = ratio of girls x total strength / total ratio = 4 x 27/9 = 4 x 3 = 12 verification: 15 + 12 = 27