3 years ago, the ratio of Chintu and his father’s age is 1 ∶ 8 and the present age of Chintu’s grandmother is twice the present age of Chintu’s father and the present age of Chintu’s mother is 3/5 of the present age of Chintu’s grandmother. If the average of the present age of Chintu’s grandmother and his mother is 56, then find the ratio of the age of Chintu’s father and Chintu’s mother after 10 years.
1
45 ∶ 52
2
52 ∶ 45
3
42 ∶ 55
4
55 ∶ 42
5
None of these