Answer:
$6 per child ticket
Explanation:
Since the adult ticket cost is given, we can multiply that by the amount of adult tickets sold to get the portion of the total money made is adults only.
300 × 10 = $3000 in adult tickets sold
7200 - 3000 = $4200 in children tickets sold
Since we know there were 700 children tickets sold we can divide these amounts to get the cost of a children ticket.
4200 ÷ 700 = $6 per child ticket