To find the number of degrees the temperature dropped per day, you can divide the total temperature drop by the number of days:
Total temperature drop = 27 degrees
Number of days = 3 days
Degrees per day = Total temperature drop / Number of days
Degrees per day = 27 degrees / 3 days
Degrees per day = 9 degrees per day
So, the temperature dropped by 9 degrees per day over the course of 3 days