Question

If the volume of a sphere is divided by it's surface area, then the result is 56. The radius of the sphere is?

Answer 1

Volume of sphere = 4/3πr³

Surface area of the sphere = 4πr²

4/3πr³ ÷ 4πr² = 56

4/3πr³ = 56 × 4πr²

4/3r = 56 × 4 [ cancelling πr² from both the sides ]

r = 56 × 4 × 3/4

r = 56 × 3

r = 168

Hope it helps u.....