Question 838290
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Hi,
center sells 85 tickets 
{{{highlight_green(x)}}} adult and {{{highlight_green(85-x)}}} children tickets
Adult tickets are $5 each and children get in for $2.
center collects $275
 $5x + $2(85-x) = $275 ****
  5x + 170 - 2x = 275
     3x = 105
      x = 35 adult tickets  sold
CHECKING our answer*** (50 childen tickets sold :  85-35
$5*35 + $2* 50 = $175 + $100 = $275