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A and B can do a piece of work in 21 and 24 days respectively.They start the work together and after some days, A leaves and B completes the rest of the task in 9 days. After how many days did A leave? | |
A. | 5 [Wrong Answer] |
B. | 6 [Wrong Answer] |
C. | 7 [Correct Answer] |
D. | 8 [Wrong Answer] |