A mason constructs a wall of dimensions 270 cm × 300 cm × 350 cm with bricks each of size 22.5 cm × 11.25 cm × 8.75 cm. If it is assumed that 18 of the space is covered by mortar, then the number of bricks used is:

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?