The diameter of a metallic sphere is 6 cm. It is melted and drawn into a wire having a diameter of the cross-section as 0.4 cm. Find the length of the wire (in meters).

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?