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CBSE Class 9 Answered

90 persons can dig a well in 40 days. After they have worked for 10 days, how many more persons Should be employed to complete the work in another 20 days 
Asked by Pammiprasad150 | 17 Nov, 2018, 01:27: PM
answered-by-expert Expert Answer
number of persons working = 90
number of days required to complete = 40
 
hence the work requirement = 90×40 = 3600 man-day
 
90 persons worked for 10 days, hence completed work = 90×10 = 900 man-day
 
Remaining work = 3600 - 900 = 2700 man-day
 
if remaining work has to be completed in 20days, then required persons = 2700 / 20 = 135
Answered by Thiyagarajan K | 17 Nov, 2018, 09:36: PM

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