Question 494362
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It takes 4 men 14 days to do a certain job. 
How long should it take 7 men working at the same rate to do the same job?
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                This can be solved  MENTALLY  and  MOMENTARILY.



(1)    The whole job is    4 * 14 = 56 man-days.


(2)  &nbsp;&nbsp;7 men will make it in  &nbsp;&nbsp;56/7 = 8 days. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>


Solved.



It is how my teachers taught us solving such problems 65 years ago.