Year-wise Number of Girls in Different Universities
| Year | University A | University B | University C |
| 2015 | 15,000 | 10,000 | 5,000 |
| 2016 | 10,000 | 17,500 | 20,000 |
| 2017 | 22,500 | 12,000 | 15,000 |
| 2018 | 20,000 | 25,000 | 15,000 |
| 2019 | 25,000 | 20,000 | 22,500 |
What is the ratio between the total number of girls enrolled in University C in the year 2018 and the total number of girls enrolled in University A and University B together in the same year?