Answer:
Adult tickets sold = 250
Step-by-step explanation:
Adult tickets sold = x
Student tickets sold = x + 56
The sum of all tickets, then, is:

Combining like terms:

Subtracting 56 from both sides:

Dividing both sides by 2:

Therefore, the adult tickets sold is x = 250 and the student tickets sold is x + 56 = 250 + 56 = 306.