Answer:
32% of students went on this field trip.
Explanation:
Given : 80% of 6-graders and 20% of 5-graders went on a field trip. If there are 20 6-graders and 80 5-graders.
To find : What percent of students went on this field trip?
Solution :
Let A be the 6-graders students.
B be the 5-graders students.
We have given, A=20 and B = 60
According to question,
80% of 6-graders going on trip
i.e.



20% of 5-graders going on trip
i.e.



Total number of students going on the field trip is



32 students out of 100 students.
Into percentage,

Therefore, 32% of students went on this field trip.