Question 1046311
Let x and y represent the number of students and adults respectively.
x + y = 500 . {{{x = 500-y}}}
13.50x + 16.00y = 7562.50  (In dollars)
13.50x + 16.00y = 7562.50
13.50(500-y) + 16.00y = 7562.50
Solve for y and substitute that in to find x {{{x=500-y}}}