If the heights of two cones are in the ratio of 1 : 4 and the radii of their bases are in the ratio 4 : 1, then the ratio of their volumes is

If the base radius and the height of a right circular cone are increased by 20%, then the percentage increase in volume is approximately

The diameters of two cones are equal. If their slant heights are in the ratio 5 : 4, the ratio of their curved surface areas, is

If h, S and V denote respectively the height, curved surface area and volume of a right circular cone, then 3πVh³-S²h²+9V² is equal to

If a cone is cut into two parts by a horizontal plane passing through the mid-point of its axis, the ratio of the volumes of upper and lower part is