question archive Please answer question 6 and show how the problem was solved

Subject:MathPrice: Bought3

Please answer question 6 and show how the problem was solved. Problem #6- A group of people bought movie tickets at the AMC Century City. They bought a total of 7 tickets, some adult and some kid tickets. They spent a total of &2 dollars. If adult tickets cost 12 dollars and kid tickets cost 9 dollars