Answer: 132 children's tickets and 251 adult tickets were sold.
Explanation:
Let x represent the number of children tickets that were sold.
Let y represent the number of adult tickets that were sold.
A total number of 383 tickets were sold. This means that
x + y = 383
Children's tickets cost $4 each and adult tickets cost $6 each. If the total amount for which the tickets were sold is $2034, it means that
4x + 6y = 2034 - - - - - - - - -- -1
Substituting x = 383 - y into equation 1, it becomes
4(383 - y) + 6y = 2034
1532 - 4y + 6y = 2034
- 4y + 6y = 2034 - 1532
2y = 502
y = 502/2
y = 251
x = 383 - y = 383 - 251
x = 132