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?
A) 2 B) 3 C) 4 D) 5
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In 1 day, 12 men will complete 1/9 of work
In 6 days 12 men will complete 6/9=2/3 of work
So after 6 days the work left is 1/3
Therefore 12 men will complete the 1/3 work in 3 days
so 1 man will complete 1/3 of the work in 36 days
There 18 men(12+6) will complete the remaining work in 36/18= 2 days
~~~~~~~quora
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