Question 24
A light rail network has 21 drivers, but not all of them are required at the same time:
- 15 drivers are required for the Friday night shift.
- 12 drivers are required for the Saturday morning shift.
- 9 drivers are required for the Sunday morning shift.
Given that every driver must work on at least one of these shifts, what is the maximum number of drivers that can work on all three shifts?
- 15 drivers are required for the Friday night shift.
- 12 drivers are required for the Saturday morning shift.
- 9 drivers are required for the Sunday morning shift.
Given that every driver must work on at least one of these shifts, what is the maximum number of drivers that can work on all three shifts?