Paper costs Rs. 30 per kg. How much expenditure would be incurred to cover the entire outer surface of a solid cube of edge 10 m with paper, if one kg of paper covers 10 sq. m of area?

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?