The length, breadth and depth of a cuboidal tank are 6.5 m, 5.4 m and 3 m, respectively. It is two-third full of water. The quantity of water, in litres, in the tank 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?