The sum of the ages of a father and his son is 50 years. Four years ago, father's age was six times as that of his son. What are the present ages of the father and son respectively?
1
35 yrs, 15 yrs.
2
38 yrs, 12 yrs.
3
40 yrs, 10 yrs.
4
42 yrs, 8 yrs.