Question 386033
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Hi,         
Let x, 2x and (x+4) represent John's, Mark's and Mary's earnings
    x + 2x +(x+4) = $102
Soving for x
      4x + 4 = $102
          4x = $98
           x = $24.50, John's earnings.  Marks' $49 and Mary's $28.50

CHECKING our Answer
  $24.50 + $49 + $28.50 = $102