Directions: Study the following details carefully and answer the questions asked.

The information given below is regarding the number of students who appeared in three different exams P, Q, and R in four different years 2017, 2018, 2019, and 2020.

In 2017:

Students who appeared in exam P was twice the students who appeared in exam Q. Total students who appeared in three exams together was 3280. Students who appeared in exam Q was 80 more than students who appeared in exam R.

In 2018:

Students who appeared in exam Q were 40% more than students who appeared in exam P while students who appeared in exam R were 20% more than students who appeared in exam Q. Total students who appeared in all three exams together was 4896.

In 2019:

The ratio of students who appeared in exam P to exam Q was 7 : 9. Students who appeared in exam R was 25% more than students who appeared in exam Q. Total students who appeared in all three exams together was 4360.

In 2020:

The average of students who appeared in exams P and Q was 1120. Students who appeared in exam R was 1200. The ratio of students who appeared in exam P to exam R was 4 : 5.