Respuesta :

AL2006
7 workers take 48 days to do one full job.

Together, they do (1/48) of the job per day.

Each worker does (1/7) of (1/(48) = 1/(48·7) of the job per day.

12 workers would do (12 / (48·7) = 1/(4·7) = 1/28 of a job per day.

So it would take them 28 days to do one whole job. 

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