12 men can complete a work in 90 days. 30 days after they started work, 2 men left and 8 men joined. How many days will it take to complete the remaining work?
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-12 men can do 12 unit of work
-therefore in 90 days = 90 × 12
= 1080 unit
-therefore in 30 days = 30 × 12
= 360 unit
-remaining work = 1080 - 360
= 720 unit
-amount of work = 18 unit per day
done by 18 work
days remaining = 720/18
= 40
therefore 40 days it will take to complete the remaining work
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