Answer:
A + C = 300
5A + 3C = 700
Explanation:
We can let A represent the total number of adult tickets and C represent the total number of children tickets.
# of adult tickets + # of children tickets = total number of tickets (300)
We multiply the total number of adult tickets sold by 5 to find the total revenue earned from adult tickets.
Similarly, we multiply the total number of children tickets sold by 3 to find the total revenue earned from children tickets.
Revenue from adult tickets + revenue from children tickets = total revenue ($700).