A family has 4 members. The sum of the age of father and son is 50 years. The ratio of the age of father and daughter 6 years back is 16 ∶ 5. The ratio of the age of mother and daughter 4 years later is 9 ∶ 5. Find the present age (in years) of the mother if the daughter is 4 years elder to the son.
1
32
2
36
3
38
4
40
5
45