A solid gold sphere of radius 3 cm is melted to form three smaller spheres. If the radii of two of these spheres are 1.5 cm and 2 cm, then the radius of the third sphere 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?