Hi,

Six hundred people attended the premiere of a motion picture. 

Adult tickets cost $6, and children were admitted for $2. 

Question states***box office receipts totaled $2880

 6x + 2y = 2880    |  y = 600-x

 6x + 2(600-x) = 2880

    4x = 1680

     x = 420, number of adults, 180 children    

and

 

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