A solid sphere and a hollow sphere have the same outer radius. The solid sphere has a volume of 36π cubic units, while the hollow sphere has a volume of 16π cubic units. What is the ratio of the inner radius of the hollow sphere to the outer radius?
A solid sphere and a hollow sphere have the same outer radius. The solid sphere has a volume of 36π cubic units, while the hollow sphere has a volume of 16π cubic units. What is the ratio of the inner radius of the hollow sphere to the outer radius?