Write an equation, containing divison and subtraction that has 8 as a solution

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out