The height of a solid right circular cylinder is 15 cm. If 4 times its curved surface area is equal to 6 times the sum of the areas of its bases, then its volume (in cm3) is equal to:

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?