A school is planning to hold an event at a local venue, which will charge a fixed rental fee of $630 for the event plus $16.90 per guest for food. The university has budgeted $875 for administrative and marketing expenses. It plans to hire a band, which will cost another $465. Tickets are expected to sell for $40.30 per guest. Ignore taxes. How many tickets must be sold if the university plans to raise $4,865 in net cash flow from this event?