Posted by **Josh** on Saturday, October 21, 2006 at 11:06am.

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.

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