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Let the present ages of 'A' and 'B' be '3x' years and '7x' years, respectively. So, 7x - 3x = 12 Or, 4x = 12 So, x = 3 So, present age of 'A' = 3 X 3 = 9 years And present age of 'B' = 7 X 3 = 21 years So, three years hence from now, ages of 'A' and 'B' will be 12 years and 24 years, respectively. So, required percentage = {(24 - 12)/12} X 100 = 100%
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