Valerie drives to and from work 5 days a week. the distance from her home to work is 6 miles. over the course of 5 days, her car uses 1/4 of a tank of gas.
If the tank is full with gas she can drive 240 miles (or 20 times/days to and from work) I guess you have forgotten to write the question, but I hope this i what you are looking for. If not, let me know so I can help you further. Enjoy your day.