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2015-07-14T18:35:04+08:00

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Let x be the 1st number                 
      2x the 2nd number
      4x-3 the 3rd number
x + 2x + 4x -3 =81
7x = 81 + 3
7x = 84
 7      7
x = 12
Therefore 12 is the 1st number,  2(12) = 24 is the 2nd number,  4(12) - 3 = 45 is the 3rd number.
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