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

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

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

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

The volume of a sphere of radius 2r is