RRB NTPC CBT 2 Level 4 Exam 10 May 2022 Shift 1

To do a certain work, the ratio of the efficiencies of A, B and C is 3 ∶ 5 ∶ 8. Working together, they can complete the same work in 15 days. If only A and B work together for 12 days and leave, and then C comes to complete the remaining work, for how many days will C work?