If the radius of a sphere is tripled, what is the ratio of the volume of the original sphere to that of the second?
1 : 3
1 : 27
1 : 9
27 : 1
If the radius of a sphere is tripled, the ratio of the surface area of original sphere to that of the second is
If the radius of a sphere is doubled, what is the ratio of the volume of the first sphere to that of the second sphere?