If the radius of the base of a right circular cylinder is reduced to one-third while keeping the height the same, what is the ratio of the volume of the reduced cylinder to that of the original 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?