Question 1145982
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Let x be the number of children's tickets; then the number of adult tickets is 2x.


The revenue equation is then


    5x + 6*(2x) = 391.


Simplify and solve


    5x + 12x   = 391

    17x        = 391

      x        = 391/17 = 23.


<U>ANSWER</U>.  23 children's tickets and 2*23 = 46 adult tickets.


<U>CHECK</U>.   5*23 + 6*46 = 391 dollars.   ! Correct !
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Solved.