A College sold Advance tickets to a play at $4 per ticket. Anyone who attended and purchased a ticket at the door had to pay $5 a ticket.

A College sold Advance tickets to a play at $4 per ticket. Anyone who attended and purchased a ticket at the door had to pay $5 a ticket. A total of 480 people attended the play, and the revenue (earnings) from the ticket sales was$ 2100. How many people bought tickets at the door?ap + door=480 4*ap + 5*door=2100 in the first equation, ap= 480-door Put that into the second equation for ap, and then solve.Hi! Very nice site! Thanks you very much! QI0KOULXtvi