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Make a chart, and for each worker, write down the total number of hours that he or she worked in the three months. Then add up all of those numbers to get the total number of man-hours during the three months. For example:

Worker's name Total hours worked

Jose 320 hours

Jese 400 hours

Joan 500 hours

Jill 200 hours

Jackie 415 hours

Jodie 90 hours

Jupiter 282 hours

Total man hours 2207 hours

Obviously, this is a simplified example; since you had up to 20 workers, but just expand on this idea up to the number of workers that you had.

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Q: How do you calculate man hours for a 3 months period and the number of workers varies from 4 sometime to 20 within the same three months?
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