A can complete a piece of work alone in 20 days. while B can do it alone in 30 days. They worked together for 5 days and left. The rest of the work is completed by C alone in 7 days. In what ratio should the payment be divided among them?
1
4 ∶ 5 ∶ 6
2
3 ∶ 2 ∶ 7
3
1 ∶ 8 ∶ 9
4
2 ∶ 6 ∶ 9