Question 763370
Adult tickets = x
Student tickets = y
x + y = 304...1
4x + y = 589...2
Subtract (1) from (2)
3x     = 285
 x     = 95
Substitute x = 95 in (1)
x + y = 304
95 + y = 304
     y = 304 - 95
     y = 209
Adult tickets sold = 95
Student tickets sold = 209.
Hope this helps.
:-)