A contractor puts 20 men on a stretch of village road, a job scheduled to take 30 days. After 12 days he moves 5 of them to another site. Working at the same rate, the men left behind take how many more days to finish the stretch?

Question

Accepted Answer

24. The job is 20 × 30 = 600 man-days. In 12 days 20 × 12 = 240 man-days are done, leaving 360 for 15 men, i.e. 360/15 = 24 more days. The 18 days still left on the schedule would only be enough for 20 men; and 36 is the total length of the job (12 + 24), not the extra time asked for.

A contractor puts 20 men on a stretch of village road, a job scheduled to take 30 days. After 12 days he moves 5 of them to another site. Working at the same rate, the men left behind take how many more days to finish the stretch?

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