A solid iron sphere of radius 12 cm is melted and recast into smaller solid spherical balls, each of radius 4 cm. If 25% of the iron is lost during the melting process, how many complete smaller balls can be made?

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?