The sum of two numbers is 105. the larger number is twice the smaller number. find the smaller number

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.

With both problems. a.s.a.p directions on photo ^

What multiplys to be 1 but adds up to be 4