Question

If all students of a class sit in a circle in the order of their roll numbers, it is found that a student with roll number 7 sits exactly opposite to the student with roll number 31. What is the number of students in the class​

Answer 1

imagine a circle a point exactly oposite to another, draw a line joining the two points. You will see that two side portions are equal.

now count (31-7)=24 and calculate (24-7)=17 and the answer is (31+17)=48 students