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729/8
If the ratio of the radii is 1:3 then the ratio of volumes is 1:27.
16/9
ratio would also be 2 since the volume of a sphere is 4/3(pie)r(cubed) and since both 4/3 and pie are constants the variable is the radius of the spheres and as such the ratio of the radii would be equal to that of the volumes.
volume goes a radius cubed so (8/5) cubed = 4.096