If a cone has the same radius and height as a cylinder, the volume of the cone is

one-fourth one-third half two-thirds

the volume of the cylinder. If a cylinder and a sphere have the same radius and the cylinder's height is twice its radius, then the volume of the sphere is

one-fourth one-third half two-thirds

the volume of the cylinder.

The answer to this question would be:

First problem = one-third

Second problem = two-third

To answer this question, you need to know the formula for cylinder volume, cone volume and sphere volume. The formula would be:

cylinder volume = π * r^2 * h

cone volume = π * r^2 * h / 3

sphere volume = 4/3 π r^3

From the first problem, the radius and height of the cylinder are same as the cone. Then the calculation would be:

cone volume / cylinder volume = (π * r^2 * h / 3) / (π * r^2 * h) = 1/3

The first answer is one-third.

For the second problem, the radius of the cylinder and sphere is same, but the cylinder height is twice as it radius. Then the calculation would be:

volume of sphere / volume of cylinder = (4/3 * π * r^3) / (π * r^2 * h)

(4/3 * π * r^3) / (π * r^2 * 2r) =

(4/3 * π * r^3) / (2 * π * r^3) =

(4/3) / 2 = 4/6 = 2/3

Then the second answer is two-third