If the height and the radius of a cone are doubled, the volume of the cone becomes

A right circular cylinder and a right circular cone have the same radius and the same volume. The ratio of the height of the cylinder to that of the cone is

The radii of the bases of a cylinder and a cone are in the ratio 3 : 4 and their heights are in the ratio 2 : 3. Then, their volumes are in the ratio

A solid metallic cylinder of base radius 3 cm and height 5 cm is melted to make solid cones of height 1 cm and base radius 1 mm. The volume of is

A conical tent is to accommodate 11 persons such that each person occupies 4m² of space on the ground. They have 220 m³ of air to breathe. The height of the cone is