Answer:
700
Step-by-step explanation:
Let a = number of adults.
Let c = number of children.
a + c = 2200
4a + 1.5c = 5050
Solve the first equation for c:
c = 2200 - a
Substitute 2200 - a for c in the second equation.
4a + 1.5(2200 - a) = 5050
4a + 3300 - 1.5a = 5050
2.5a = 1750
a = 700
Answer: 700 adults