Acompany manufactures exercise balls. type a is a spherical ball with a radius of 12 inches. type b is a spherical ball with a radius of 16 inches. what is the ratio of the surface area of type a to the surface area of type b?

We know that

[surface area of sphere]=4πr²
Type A
r=12 in
[surface area of sphere A]=4π12²> 576π in²

Type B
r=16 in
[surface area of sphere B]=4π16²> 1024π in²

[the ratio of the surface area of Type A to the surface area of Type B]
=576π/1024π> 9/16> 0.5625

the answer is
9/16 (0.5625)

If you make it a little more clear i can answer it