Correct option is B
Solution:
Total students in school = 3000 + 2500 = 5500
Total students in college = 9000 + 11000 = 20000
Total students in university = 15000 + 16000 = 31000
Total number of the students = 5500 + 20000 + 31000 = 56500
Total teachers in college and university = 1500 + 2000 = 3500
Ratio = 56500 : 3500
=> 113 : 7
Thus, the required answer is 113 : 7.




