Asked by Kenny

Children and adult tickets were sold for a local play. The children and adult tickets sold for $11 and $16, respectively. If 150 tickets were sold, and the total revenue was $2250 for the night, find the number of children and adult tickets sold.
Answered by Steve
add up the head-count, and the revenue:

c+a = 150
11c+16a = 2250

Now just solve for c and a.