Discussion
12 men complete a work in 9 days. After they have worked for 6 days, 6 more men join them. How many days will they take to complete the remaining work?
Answer: A
Total work = \(12 \times 9 = 108\) man-days. Work done in 6 days by 12 men = \(12 \times 6 = 72\) man-days. Remaining work = \(108 - 72 = 36\) man-days. Now, the number of men is \(12+6=18\). Time taken to complete the remaining work = Remaining work / Number of men = 36 / 18 = 2 days.
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