A 1300-seat theater sells two types of tickets for a concert. Premium seats sell for $30 each and regular seats sell for $20 each. At one event S31,820 was collected in ticket sales with 20 seats left unsold. How many of each type of ticket was sold?

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

answer is 33

step-by-step explanation:

i think the answer would be c