Question 26057
Let number of students tikets be "x"
The number of adult tickets will be "421-x"
Value of student tickets is 200x cents
Value of adult tickets is 500(421-x)=210500-500x cents
EQUATION:
Value of student + Value of adult tickets=124400 cents
   200x + 210500-500x = 124400
   -300x= -86100
       x=287 (number of student tickets)
    421-x=134 (number of adult tickes)
Cheers,
Stan H.