The radius of a solid lead sphere is 2 cm. 2541 such spheres are melted and recast into a cube of edge x cm. Find the value of x (take π = 22/7).

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?