The rate of riders to cars is 14 divided by 2. So the unit rate is 7 riders per car. Multiply 7 riders by 12 cars to find that 84 riders can fit on the roller coaster at one time.
I want to say it's 84 combined because two roller coaters can hold 14 so seperately it's 7. 7x12=84 so I believe the answer is 84. I'm sorry if it's wrong.
