The internal length of a rectangular water tank is 5 m and depth is 1.5 m. If it can hold 30,000 litres of water, what is the internal width of the tank?

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?