A college is selling tickets for a winter fund-raiser. One day, Krissa sold 14 adult tickets and 8 student tickets for a total of $376. The next day, she sold 7 adult tickets and 11 student tickets for a total of $272. Krissa wanted to find the price of one adult ticket, a, and the price of one student ticket, s. She wrote and solved the following system of equations.
14a+8s=376
7a+11s=272
She found that the price of one student ticket is $20 and the price of one adult ticket is $12. Which statement explains Krissa's error?
A She switched the prices of the tickets.
B The solution works in both equations.
C The solution only gives the correct price for one student ticket.
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