There are 84 people waiting in line to ride a roller coaster at an amusement park.  The roller coaster has 7 cars, and each car seats 2 people.  How many times will the ride operator have to run the roller coaster to give everyone in line a turn? Give me reasons, before answering the question
Each run will hold 7 * 2 = 14 people. The ride will have to run 84 / 14 = 6 times. So the final answer is 6.