Question 646735
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Hi,
Six hundred people attended the premiere of a motion picture. 
{{{highlight(x)}}}Adult tickets cost $6, and {{{highlight(y)}}}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    {{{600-420}}}
and
{{{6*420 + 2*180 = 2880}}}