ANSWERS: 2
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32
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father = 4*son (father-5) = 9*(son-5) 9*father=36*son 4*(father-5) = 36*(son-5) 4*father - 20 = 36*son - 180 4*father - 20 = (9*father) - 180 160 = 5*father father = 32 son = 8 5 years ago: father = 27 son = 3
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