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To find out how long it takes one man to complete the job, you multiply the time it takes 20 men by 20, resulting in 600 days.
To determine how long it will take one man to complete the job, you need to consider that 20 men can complete the job in 30 days. This means 1 man will take 20 times longer, so it will be 20 times 30 days. Therefore, it will take 1 man 600 days to complete the job alone.
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