Please answer this question I would highly appreciate it if it was answered or looked on, please

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Do you mind if you guys me with this question i’m on number 8

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal