Mathematics
Medium
Question
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
B
6
C
7
✓ Official correct answer
D
8
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A
5
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B
6
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C
7
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D
8
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