Five years ago the average age of Arun and Ratul was 20 years. Ratul is 10 years junior to Arun. The average age of Arun, Ratul, and Piku is 35 years now. After 12 years, find the ratio of the ages of Piku and Arun.
1
67 : 42
2
57 : 32
3
11 : 6
4
77 : 52