The Bishop's Peak 4-H club is having its annual fundraising dinner. Adults pay $25 apiece and children pay $10 apiece. If the number of adult tickets sold is twice the number of children's tickets sold, and the total income for the dinner is $1,800, how many of each kind of ticket did the 4-H club sell?
number of kid's tickets --- x
number of adults ------- 2x
10x + 25(2x) = 1800
solve for x, sub into my definitions