Ok so we know that student tickets cost $5, and adult tickets cost $8. We also know that the total no. of tickets sold was 150.
Let's make the amount of student tickets sold be S, and the no. of adult tickets sold be A.
We know that tickets sales amounted to $1,020, so: 8A + 5S = 1020 And: A + S = 150. Multiply this by 5; 5A + 5S = 750
When you subtract the two equations; (8A+5S) - (5A+5S) = 1020-750 So 3A = 270 A = 90 So 90 adult tickets were sold. S = 150 - 90 = 60 So 60 student tickets were sold (although you don't need this as part of your answer)
