Question 831515
A = 2.25C (The theater sold 2.25 times as many adult tickets as child tickets.)
A + C = 260
Substitute the value of A
2.25C + C = 260
Add
3.25C = 260
Divide each side by 3.25 
C = 80
.
If 80 children's tickets were sold, how many adult tickets?
A = 2.25C
2.25*80 = 180
.
Revenue:
80 children's tickets at $4 apiece (what a bargain!) =  $320
180 adult tickets at $9 = $1620
Total gross sales = $320 + $1620 = $1940 <<--