60 seventh graders make up 15% of the students in the school.
The procedure to solve this problem will be to first, divide 60 by 15 to find how much people make up 1%, and then multiply that number of people by 100% to find the total of students.
Step 1. Divide 60 people by 15% to find how many people are 1% of the students:
4 students are 1% of the total students.
Step 2. Now, we multiply the number we just find in step 1 by 100% to find the total amount of students in the school:
There are 400 students in the school.
Answer: 400