Question

Bob sells hats and scarves.

Answer 1

We define variables:
 x: number of hats
 y: number of scarves
 We have the following equations:
 x / y = 4/3
 x-25 / y = 7/9
 Solving the system of equations we have
 x = 60
 y = 45
 Answer:
 Bob has 45 scarves in his store