In order to put two quantities as a relationship, just put a colon or a fraction bar in between them, in the order that the problem asks you.
In this problem, it's asking for the # of students planning to go to an instate college to the # of students planning to go to an out of state college.
So, 120 : 70
Even though it doesn't tell you to simplify, it will never hurt you, so always do it.
Both 120 and 70 can be divided by 10, so the simplified answer would be 12:7
Hope this helps!
