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Let the present age of boy be ‘x’ years. 125% of age of boy 8 years before = 75% of age of boy after 8 years => (125/100)×(x - 8) = (75/100)×(x + 8) => 125(x - 8) = 75(x + 8) => 125x - 1000 = 75x + 600 => 50x = 1600 => x = 32 yrs.