The height of a cylindrical container is 2.5 m. The diameter of its base is 2,100 cm. What will be the cost of covering the total surface area of the container with sheet at ₹14 per m2? (Take π = 227)

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?