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See diagram to understand easily.

5 and 25 are standing on the diameter.  So students with numbers 6 to 24 are on one side of the diameter.   So they are 19. So on the other side of diameter also there are 19 students.  

Hence in total there are  19 + 2 + 19 = 40 students.

6-24 members are on one side of the circle
so this side there are 19 students
the other side also there should be 19 students and two at the ends of diameter.
so the total no. of students
there were total 40 students

1 5 1