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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? | |
A. | 10 days [Wrong Answer] |
B. | 14 days [Wrong Answer] |
C. | 15 days [Correct Answer] |
D. | 9 days [Wrong Answer] |