Out of 75 students, 15 are on the student council. What percent of the students are NOT on the student council?
There are 75 - 15 = <<75-15=60>>60 students who are not on the student council.
The percentage of students who are not on the student council is 60/75 x 100% = 80%. Answer: \boxed{80}.
To find the percentage of students who are not on the student council, we need to subtract the number of students on the student council from the total number of students, and then divide by the total number of students.
Number of students on the student council = 15
Total number of students = 75
Number of students not on the student council = Total number of students - Number of students on the student council = 75 - 15 = 60
Percentage of students not on the student council = (Number of students not on the student council / Total number of students) * 100
= (60 / 75) * 100
= 0.8 * 100
= 80%
Therefore, 80% of the students are not on the student council.