28 students, 18 parents, and 4 teachers took part in a field trip. what fraction of people on the trip were students? what fraction of people on the trip were parents? what fraction of people on the trip were teachers?

In these problems, it is always a good idea to find the total population. In this case, it would be the total number of people who went on the field trip.

28+18+4=50

There are 50 people total.

To find each fraction, just put the number of students/parents/teachers over 50 and simplify.

Students
28/50=14/25

Parents
18/50=9/25

Teachers
4/50=2/25

Hope this helps!