Question 410054
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Hi
My recommendation would be to follow the following steps:
I.Defining the variable(s), might recommend using x for consistency
 majority of problems can be written in terms of one variable,
 Some require two variables and two equations, rare to see them here.
II.Stating the Question Algebraically
III.Solving for x
IV.CHECKING the Answer***

Example:  a movie was was attended by 212 people. 
Children's tickets were $4 and adult tickets were $8. If the amount from
 tickets sales was $1448, how many children and how many adults attended?

I.Let x and (212-x) represent the number of adult and children's tickets respectively
II.Question states***
 8x + 4(212-x) = 1448
III.Solving for x
     4x = 600
      x = 150, number of adult tickets. 62 children's tickets. (212-150)  
     
Iv.CHECKING our Answer***
    $8*150 + $4*62 =  $1200 + $248 = $1448