Answer:
110
Step-by-step explanation:
x = adult's tickets
y = student's tickets
{x + y = 250
{5x + 7y = 1530
{- 5x - 5y = - 1250
{5x + 7y = 1530
--------------------------
2y = 280
y = 280/2
y = 140
x + y = 250
x + 140 = 250
x = 250 - 140
x = 110
I hope I've helped you.
