The maximum number of boxes, each of length 0.2 m, breadth 0.4 m and height 0.5 m that can be placed in a large box of length 2 m, breadth 1 m and height 0.5 m 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?