A wall of dimensions 50 m × 30 m × 40 m is to be built with bricks of length 3 m, breadth 2 m, and height 1 m. The contractor has ordered 6500 bricks. How many more bricks would be required?

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?