Im losing to many brain cells please help!

Create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

We just started the introduction into circles and i have no idea how to do this.