SOLUTION: If 4 men can do the job in 9 days,how many men were needed to do the job in 12 days?

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Question 505011: If 4 men can do the job in 9 days,how many men were needed to do the job in 12 days?
Answer by Edwin McCravy(20081) About Me  (Show Source):
You can put this solution on YOUR website!
If 4 men can do the job in 9 days,how many men were needed to do the job in 12 days?
Since 4 men can do the job in 9 days, then it would take 1 man 4 times as long or 36 days.

12 days is 3 times as fast as the 36 days it would take 1 man, so it will take
3 men.

---------------------------------

Or you can use the formula

W1*T1     W2*T2 
-----  =  -----   
 J1        J2

where 
W1 = number of workers in the first ssituation = 4
T1 = number of days in the first situation = 9
J1 = number of jobs in the first situation = 1

W2 = number of workers in the second ssituation = ?
T2 = number of days in the second situation = 12
J2 = number of jobs in the second situation = 1

4*9   W2*12
--- = -----
 1      1

 36 = 12W2

  3 = W2 

Edwin