15.40 +2.80 = 18.20 (to make it half of what he is left with)
18.20 x 2 =36.40 (to find out how much he is left)
36.40-12.20 = 24.20 (to make it half of what he is left with)
24.20x 2 = 48.40 (to find out how much he is left)
48.40+ 8.00 = 56.40 (to make it 1/3 of his money)
56.40 x 3 = 169.20 (to find out how much he have at first)
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