Students can buy tickets for 2$. The admission for non students is 3$. If 330 tickets are sold and the total amount of receipts are 730
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N=number of non-students, S=number of students. S+N=330, 2S+3N=730.

N=330-S, 2S+990-3S=730, S=990-730=260, and N=70.

There were 260 students and 70 non-students.
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