arithmetic - ten years ago manojs age was three times the age of his daughter ten years hence manojs age will be twice that of his daughter the ratio of their present ages is - skillgun

Let the ages of father and daughter 10 years ago be 3x and x years.
Then, (3x + 10) + 10 = 2[(x + 10) + 10]
=> 3x + 20 = 2x + 40
=> x = 20
Required ratio = (3x + 10) : (x + 10) = 70 : 30 = 7 : 3