15. A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every Third day ? September 23, 2025 by Admin A. 12 days B. 15 days C. 16 days D. 18 days ✅ The correct answer is option C. 16 days.
