Question 411016
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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
  {{{5/3 = x/(480-x)}}}   |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