Everyone stands in a perfect, evenly spaced circle. I am in 7th place in the circle. Directly opposite me in position 791 is my friend. How many students make up the circle?

Given that he is in 7th place in the circle and 791 people over from the beginning of the circle means that there are 784 people from you to the person on the opposite end because 791 - 7 = 784. That is half the circle. Thus the complete circle is double that to get 784 X 2 = 1,568 people.