I know I'm missing something here as I cannot use an aggregate-able function (or in this case double aggregate-able function in Sum(count...)) in a where function, but can't seem to figure out how to re-write the sql. 

```
SELECT city,
       state,
       COUNT(studentID),
       COUNT(instructorID)
FROM   Student
       JOIN Instructor
       ON Student.ZIP= Instructor.ZIP
WHERE  SUM(COUNT(studentID), COUNT(instructorID)) AS TOTAL >= 10
ORDER BY total DESC;

```

The sql is supposed to List all cities that have 10 or more students and instructors combined. Show city, state, number of student residents, number of instructor residents, and total student/instructor residents in that city. Sort by total in descending order. 

I appreciate any help I could get... Thanks!