Hi

Attendance at a concert was 480

Let x and (480-x) represent the number of adults and children respectively

Question states***Sets up the Proportion

     |cross multiplying to solve for x

Solving for x

   3x = 5(480-x)

   8x = 2400

     x = 300, # if adults attending.  The # of children was 180.  (480-120)



CHECKING our Answer***

  300/180 = 5/3 

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