Hi,

If the number of adult tickets sold was 10 less than twice the number of student tickets

And...A total of 278 tickets were sold 

number of adult tickets    

number of student tickets  

number of children tickets 0r

Question states*** total revenue of $1,300 

 $6(2x-10) + $3.50x + $2.50(278-3x+10) = $1300

 12x - 60 + 3.5x + 2.5*278 - 7.5x + 25 = 1300

  8x = 1300 + 60 -695-25 

  8x = 640 

   x = 80, number of student tickets, 150 Adult and 48 Children 

CHECKING our answer***

$900 + $280 + $120 = $1300 

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