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Let the age of son = x years (Today) So, the age of father = 6x years (Today) After 20 years, the age of son will be = (x+20) years After 20 years, the age of father will be (6x+20) years By the condition, (6x+20) = 2 (x+20) or, 6x +20 = 2x + 40 or, 6x-2x = 40-20 0r, 4x = 20 or, x = 20/4 = 5 years So, today the age of son = 5 years Toady, the age of father = 5x6 = 30 years So, when the son was born, the age of father was = (30-5) = 25 years

Let son age be x years
father age will be 6x years
after 20 years
father age will be 6x + 20
son age will be x + 20
equation formed
(6x+20) = 2(x+20)
6x-2x = 40-20
4x= 20
x = 20/4
x = 5
age of son today = 5 years
age of father today = 5*6= 30 years
age of father when son born 30-5 = 25 years