Question 387933
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Hi,         
Let x and (340-x) represent the number of student and adult tickets respectively
Question States***
  $3.50x  + $5(340-x) = $1310
  $3.50x  + $5*340- 5x = $1310
     $1700 - $1310 = $1.50x
             $390 = $1.50x
           $390/$1.50 = x
              x =260, number of student tickets.  (adult tickets = 80)

CHECKING our Answer
   $3.50*260 + $5*80 = $910 + $400 = $1310