Community Gym charges a $40 membership fee and a $50 monthly fee. Workout Gym charges a $210 membership fee and a $40 monthly fee. After how many months will the total amount of money paid to both gyms be the same? What will the amount be?
The answer is 18 months. To solve you should set this up as an equation with variables on both sides, and then get the variables on one side and then solve it like a one step equation.
