The length and breadth of a rectangle are in the ratio 3 : 2. If the length is increased by 5 m keeping the breadth the same, the new area of the rectangle is 2600 m2. What is the perimeter of the original rectangle?

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?