You have 10.50. You spend 4.50 of that 10.50 on admission. You take what you have, and subtract what you spent. That is 10.50-4.50. When you do that, you get 6.00. So, you now have 6.00 to spend. If you divide 6 dollars by the 5 rides, each ride costs $1.20. 1.20x the 5 rides equals 6.00, which is what you have left after you spend 4.50 on admission.
