The ratio of the present ages of a son and his father is 1 : 3 1:3 1 : 3 . Four years from now, the father's age will be 5 2 \frac{5}{2} 2 5 tim...
Question
The ratio of the present ages of a son and his father is . Four years from now, the father's age will be times the son's age at that time. What was the father's age four years ago?