The school that William goes to is selling tickers to see a Star Wars Movie premiere. On the first day of ticket sales the school sold 35 adult tickets and 90 student tickets
for a total of $695. On the second day of sales, they took in $320 by selling 35 adult
tickets and 15 student tickets.
What is the cost of one student ticket? (no need to include a dollar sign or s an a =
with your answer, just the number)