Answer:
12/7
Explanation:
To set up a ratio of "thing 1" to "thing 2", build a fraction with "thing 1" on top (numerator) and "thing 2" on the bottom (denominator).
The ratio of in-state students to out-of-state students is
and this can be simplified ("reduced") by dividing both numbers by 9 to get the fraction 12/7.