Question 466008
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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