Question 1157255
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The 6 men can to the job in 16 days; in the first 4 days, they can do 1/4 of the job.  3/4 of the job remains.<br>
It would take the 6 men 12 more days to finish the job alone; but now 8 men are working.<br>
Increasing the number of workers by a factor of 4/3 means the remaining job will take 3/4 as long.  3/4 of 12 days is 9 days.<br>
ANSWER: The two added men worked for 9 days; the original 6 men worked for 4+9=13 days.<br>