Answer:
The ratio is 9 to 13.
Explanation:
To get the ratio, subtract the student cookies, from the total cookies.
66 - 27 = 39
Then you have the answer, 27 cookies for the students and 39 cookies for the teachers.
Then, to get the ratio in its reduced form, divide both sides by three, which is the G.C.F. (greatest common factor).
Then the answer is 9:13.