Final answer:
To find the number of children's tickets sold, you need to subtract the number of adult tickets from the total number of tickets sold. In this case, the number of children's tickets sold is 7,867.
Step-by-step explanation:
To find the number of children's tickets sold, we need to subtract the number of adult tickets from the total number of tickets sold. In this case, the total number of tickets sold is 20,682 and the number of adult tickets is 12,815. To find the number of children's tickets, we can subtract 12,815 from 20,682:
Number of children's tickets = Total number of tickets - Number of adult tickets
Number of children's tickets = 20,682 - 12,815 = 7,867