The radius of a spherical balloon increases from 10 cm to 20 cm when more air is pumped into it. The ratio of the surface area of the inflated balloon to that of the original balloon is:

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?