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20 men can do a piece of work in 18 days. They worked together for 3 days, then 5 men joined. In how many days is the remaining work completed?
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Explanation:
20 men = 18 days
=Work done by 20 men working
Together = 1 work
=Work done by them in 3 days working
Together = 1×3=3 work
Remaining work =18−3= 15 work
15 work is to be done (20+5)=25 men
Efficiency of 20 men=1
Efficiency of 1 man = 1\20
Efficienc of 5 men=5\20=1\4
So, efficiency of (20+5)
25 men = 1 1\4=5\4working days
Required time =work\ Efficiency=15 5\4=12 days
Therefore, 12 more days will be taken to finish the
remaining work.