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1. |
A, B and C can do a piece of work in 18, 24 and 36 days, respectively. They work alternately, first day C, second day B and third day A, fourth day C and so on. How many days will be needed to complete the work like this way ? |
A. | 18 |
B. | 20 |
C. | 24 |
D. | 30 |
E. | 36 |
Answer» D. 30 | |