is the answer correct?

Alice’s school is selling tickets to the school carnival. On the first day of ticket sales, the school sold 3 adult tickets and 9 student tickets for a total of $75. The second day, the school sold $67 by selling 8 adult and 5 student tickets. What is the price each of one adult and one student ticket?

answer: student price $7, adult price $4

2 answers

3a+9s = 75
8a+5s = 67
The answer is correct, but what a ripoff!
What school charges more for student tickets than for visitors?
Haha, good.