Answer:
They sold 160 children's tickets.
Explanation:
With the information provided, yoou can write the following equations:
x+y=233 (1)
8x+12y=2,156 (2), where:
x is the number of tickets for children 12 and under
y is the number of tickets for anyone over the age of 12
Now, you can solve for x in (1):
x=233-y (3)
Then, you have to replace (3) in (2) and solve for y:
8(233-y)+12y=2,156
1,864-8y+12y=2,156
4y=2,156-1,864
4y=292
y=292/4
y=73
Finally, you can replace the value of y in (3) to find x:
x=233-73
x=160
According to this, the answer is that they sold 160 children's tickets.