Answer:
$5
Explanation:
Let the cost of a children's ticket be x.
The cost of an adults ticket would be x + 3. (adult ticket costs $3 more than a children's ticket.)
200 adult tickets would cost 200(x+3), and 100 children's ticket would cost 100x.
The combined costs of children's ticket and adult would be 200(x+3) + 100x.
Using these information, the equation: 200(x+3) + 100x = 2100 can be formed.
200(x+3) + 100x = 2100
200x + 600 + 100x = 2100
300x = 1500
x = 5
The children's ticket cost $5.
Double check.
200*8 + 100*5 = 2100.