Question 993121
.


            The mistake which  @CubeyThePenguin made in his post is   H U G E.


            I   N E V E R   saw people making such a   H U G E    mistake in such simple problem.


            Below find my  2-lines correct solution.



<pre>

The entire job is   8 men * 15 hours = 120 man-hours.


6 men will complete the job in  {{{120/6}}} = 20 hours.    <U>ANSWER</U>
</pre>

Solved  (correctly).



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Direct proportion, which @CubeyThePenguin uses in his &nbsp;(or her) post, &nbsp;DOES &nbsp;NOT &nbsp;WORK &nbsp;for this problem.



For your safety, &nbsp;ignore his post.


Consider it as an example on how this problem should &nbsp;NEVER &nbsp;be solved.