Question 1183913
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The entire job is   20*5 = 100  man-days.


To complete the job in &nbsp;2 &nbsp;days,  &nbsp;&nbsp;{{{100/2}}} = 50 &nbsp;&nbsp;men are needed.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>



Solved.