To answer this question, you will set up an equation to represent the total number of tickets sold. See the attached picture (#1).
You can rewrite this equation as what c = .
Now you have how many children tickets were sold in terms of adult tickets.
You will then write an equation, using only the variable a to find how many adult tickets were sold. See attached picture (#2).
Solve to find the number of adult tickets and then use it find the number of children's tickets sold. See attached picture (#3).
Then substitute your answers back into the equation to check your work. (#4 on attached picture).