Bella has a part-time job at an ice cream shop. Every week, she works one shift on the weekend and a few shifts after school. The graph shows the relationship between the number of hours she works after school and the total number of hours she works in a week.
One week, Bella worked 10 hours after school. The next week, she had a big history test, so she only had time to work 5 hours after school. How many total hours did Bella work in both weeks?
