Hi,

27 tickets 

Let x and (27-x) represent the # of adult and student tickets respectively

Question states***

 6.50x + 2(27-x) = 139.50

     4.5x = 85.5

        x = 19, number kathy sold. Ron sold 8.  (27-19)

CHECKING our Answer***

 $6.5*19 + $2*8 = $123.50 + $16 = $139.50 

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