Afactory makes 1200 shirts every 6 hours. the factory makes shirts for 9 hours each workday. enter the fewest number of workdays the factory will need to make 12,600

1200 shirts every 6 hours is the same as 200 shirts every hour.
then you multiply 200 by 9(total number of hours in work day) to get 1800 (total number of shirt made in work day)
You're trying to achievce 12,600 shirts so just divide by 1800
12600/1800 = 7
it would take 7 days to make all those shirts