SOLUTION: If it takes 6 men 12 days to build a wall, how long will it take 12 men?

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Question 824303: If it takes 6 men 12 days to build a wall, how long will it take 12 men?
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
The wall took a total of 6*12 = 72 man days to build.


1 (the job) = x * 72 where x is the rate each man works.


1/72 = x = the amount of the wall each man builds per day.


1/72 * 12 = 12/72 of the wall built (by 12 men) each day. We need a total of 72/72 (1) wall.


72/12 = 6 days for the 12 men to build the wall.


You can also look at it simple. 12 men complete the wall twice as fast as 6 men. They complete the job in half the time. So 12 men complete the wall in 12/2 = 6 days.