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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? | |
A. | 12 [Wrong Answer] |
B. | 15 [Correct Answer] |
C. | 16 [Wrong Answer] |
D. | 18 [Wrong Answer] |