Question

Kelly works for Quick Oil Change. If customers have to wait longer than 20 minutes for the oil change, the company does not charge for the service. The fastest oil change that Kelly has ever done took 6 minutes. Show the possible customer wait times in which the company charges the customer.

Answer 1

`6 \le x \le 20`

Explanation:

Call x the time that Kelly takes to change oil. If the wait time is charged to the customer, then, x must be less or equal than 20 minutes. If the fastest oil change that Kelly has ever done took 6 minutes, then, x will be greater or equal than 6. In mathematical terms,
`6 \le x \le 20`