The following table presents the age distribution of university presidents when they first assumed office.
| Ages | Number |
|---|---|
| 35-39 | 1 |
| 40-44 | 3 |
| 45-49 | 9 |
| 50-54 | 12 |
| 55-59 | 6 |
| 60-64 | 4 |
Of those university presidents who were at least 45 years old when they first took office, what fraction were younger than 55?
