Five hundred tickets were sold for a recent music concert. The upper deck
seats, u, sold for $37.50; the regular
seats, r, sold for $58.50; and the floor
seats, F, sold for $77.00. The total
revenue for the concert was $28,450.
There were twice as many upper deck
seats sold as the sum of regular seats
and floor seats.
Which system of equations can be
used to determine how many of each
seat were sold?