The ages (in years) of Hari and Harry are in the ratio 5 ∶ 7. Four years from now, the ratio of their ages will be 3 ∶ 4. Their present ages are :
1
Hari 28 years, Harry 20 years.
2
Hari 20 years, Harry 28 years,
3
Hari 15 years, Harry 21 years.
4
Hari 21 years, Harry 15 years.