Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 ทุกครั้งที่ขับรถจะรองรับได้ 7 * 2 = <<7*2=14>>14 คน
รถไฟจะต้องทำงาน 84 / 14 = <<84/14=6>>6 ครั้ง