If both length and breadth of a cuboid are increased by 50%, then by what percentage should its height be reduced so that its volume remains the same?

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?