A can complete a job in 20 days. B can do it in 30 days. A and B start working together and A leaves 10 days before the job is done. In how many days will the job be completed?
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A can complete a job in 20 days. B can do it in 30 days. A and B start working together and A leaves 10 days before the job is done. In how many days will the job be completed?