12 men can finish a piece of work in 18 days. Six days after they started working, four new men joined. How long will ot take to finish the remaining work, if all the workers are equally efficient.
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Answer:If 12 men can complete a job in 18 days, it means the job requires the input of 12*18 = 216 man-days.
In six days the work completed is 12*6 = 72 man-days of work. What remains to be done is 216–72 = 144 man-days of work. So if 4 more men are added the work force becomes 16 man, strong.
So the remaining work can be completed in 144 man-days / 16 men = 9 days.
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