Explanation

Since the student is 13th from the right, there are 12 students to their right.

And since they are 8th from the left, there are 7 students to their left.

To find the total number of students, you can add the number of students to their left and right, plus 1 (the student themselves):

7 (to the left) + 12 (to the right) + 1 (the student) = 20

So, there are 20 students in total.