Hi,

Five thousand tickets were sold. 

Let x and (5000-x)represent the number of $6 tickets and $3 tickets respectively

Question states***

 $6x + $3(5000-x) = $18,000

Solving for x

     3x = 3000

      x = 1000, number of $6 tickets.  4000 $3 tickets sold

      

CHECKING our Answer***

 $6*1000 + $3*4000 = $6000 +  $12,000 = $18,000 

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