Answer-
Part A-
School A would have 18 students in each classroom
Part B-
School B would have 26 students in each classroom
Part C-
24 students would have to transfer from school B to school A for the classrooms at both schools to be the same because then all classrooms would have 20 students.
Explanation:
Part A-
216/12=18
Part B-
104/4=26
Part C-
104-24=80
80/4=20
216+24=240
240/12=20
Hope this helps !!!!