To represent the situation, we can set up an equation based on the total revenue generated from selling adult and student tickets.
Let:
- \( a \) = number of adult tickets sold
- \( s \) = number of student tickets sold
The cost for each adult ticket is $4, and the cost for each student ticket is $2.50. The total revenue from all tickets sold is $2,820.
The equation representing this situation is:
\[ 4a + 2.5s = 2820 \]
This equation can be used to find the number of adult and student tickets sold.