Hi,

Let x represent the number oF student tickets sold, (350-x) the # of adult tickets

Question states***

 3x + 5(350-x) = 1450

      -2x = -300

        x = 150, the number oF student tickets sold



CHECKING our Answer*** Note 200a adult tickets sold  (350-150)

 $3*150 + $5*200 = $450 + $1000 = $1450 

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