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 

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