Answer:
6 chaperones on 80 students.
Step-by-step explanation:
Here is the complete question: School guideline required that there must be 2 chaperones for every 25 students on a school trip. how many chaperones must there be for 80 students?
Given: There must be 2 chaperones on every 25 students.
Now, we will use unitary method to solve.
We know 2 chaperones = 25 students
∴ one student required 
Next for 80 students, we require= 
∴ For 80 students, we require
, however, we cannot use decimal for number of person, so we can round off the number to 6 chaperones on every 80 students.