How do I solve this question. I am not simply looking for an answer. Thank you! A large children's organization purchases tickets to the circus.

How do I solve this question. I am not simply looking for an answer. Thank you!

36. A large children's organization purchases tickets to the circus. The organization has a strict rule that every 2 children must be accompanied by one adult guardian. Hence, the organization orders 2 times as many child tickets as it does adult tickets. Child tickets are $7 and Adult tickets are $11. If the total cost of tickets is $375, how many adult tickets were purchased.