The ratio of age of the father to his son was 12 : 5 before 5 years. After 5 years the age of the father is twice of his son. The average present age of the father, mother, son and daughter is 47.5 years. The difference between the present age of mother and his daughter is 25 years. Find the present age of daughter.
1
30 years
2
35 years
3
40 years
4
45 years
5
Data inadequate