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12 men can complete a work within 9 days. After 3 days of the work, 6 men joined them to replace 2 men. How many days will they take to complete the remaining work?
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Explanation:
12 men can complete 1\3 work in 3 clays.
Remaining 2\3 work in 6 days.
One man can complete 2\3 of work in (12×6)
= ’72 days
Number of men 12 – 2 + 6 = 16
16 men can complete 2\3 of work in 72\16 days
= 4 8\16 days = 4 1\2 days