- A 30
- B 40
- C 50
- D 60
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Answer:
D
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The work rate of A and B together is 1/30 of the task per day,
and they work together for 20 days, completing 2/3 of the task.
The remaining work is 1/3 of the task, which A finishes in 20 days.
This means that A's work rate is 1/3 of the task per day.
Therefore, it will take A 60 days to complete the task on their own.
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