99. P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day? September 23, 2025 by Admin A. 10 days B. 14 days C. 15 days D. 9 days ✅ The correct answer is option C. 15 days.
