Two circular cylinders of equal volume have their heights in the ratio 1 : 2. The ratio of their radii is

The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio 5:3. The ratio of their volumes is

The ratio between the radius of the base and the height of a cylinder is 2 : 3. If its volume is then its total surface area is

The ratio between the curved surface area and the total surface area of a right circular cylinder is 1 : 2. If the total surface area is 616 cm², then the volume of the cylinder is

In a cylinder, if the radius is halved and the height is doubled, then the volume will be