Workers
Two workers, A and B, will be done work together for 15 days. They worked together for 13.5 days. Then A worker became ill, and worker B finished the job alone for 7.5 days.
If every worker was working alone, how many days took the whole work for workers A and B?
If every worker was working alone, how many days took the whole work for workers A and B?
Correct answer:

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