The volume of a right circular cone is 80% of that of a right circular cylinder whose height is 50% more than that of the cone. If the radius of the cone is 36 cm, then what is the radius of the cylinder?

Find the approximate volume and surface area of a sphere of radius 6 cm. (Use π = 227)

Ram has two spherical balls of radius 10.5 cm each and Meena has six spherical balls of radius 7 cm each. What is the total volume of the balls that Meena has?