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The age of father 10 years ago was thrice the age of his son. Ten years hence, father's age will be twice that of his son. The ratio of their present ages




Let 3x and x years be the ages  of father and son 10 years ago

Then, (3x+10)+10 = 2{(x+10)+10}

3x+20 = 2x+40


Required ratio = (3x+10):(x+10) = 70:30 = 7:3

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