Answer:
a = 150
Step-by-step explanation:
you can set up a system of equations:
let c = child ticket
let a = adult ticket
a + c = 350
2a + 1.5c = 600
the system above can be solved by substituting:
a = 350-c or
c = 350-a
if we use 'c' we get:
2a + 1.5(350-a) = 600
2a + 1.5(350) - 1.5a = 600
0.5a + 525 = 600
0.5a = 75
a = 75/0.5
a = 150
therefore, 150 + c = 350 so 'c' must equal 200