The perimeter of a rectangle is 160 m. If the length is reduced by 10 m and the width is increased by 10 m, it becomes a square. What is the area of the rectangle in square 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?