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Math tip 27 (Updated On Friday, September 13, 2013) << Back to Page

To solve a sum dealing with number of men and number of days taken to complete a work use the logic:  1 person takes 1 day to complete 1 unit of work.
If 20 men take 20 days to complete a work, How many days it will take 40 men take?
Assume 1 person takes 1 day to complete 1 unit of work. 20 men complete 20 units in 1 day. So in 20 days, 400 units is completed. 
Hence 40 men will complete 40 units in 1 day and 40 men will complete 400 units in 10 days.
Answer is 10 days.


 

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