A can complete piece of work in 20 days and b can complete in 25 days . if they start together but after 5 days a left
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If A can complete a work in 20 days,that means he can complete 5% (1/20) in 1 day
Similarly,B can complete 4%(1/25) in 1 day
If both start together, total work completed in 5 day=5*4%+5*5%=45%
Total work left after A leaves=100%-45%=55%
Since only B is working,days required for him to complete the balance work=55%/4% per day
=13.75 days=14 days
Similarly,B can complete 4%(1/25) in 1 day
If both start together, total work completed in 5 day=5*4%+5*5%=45%
Total work left after A leaves=100%-45%=55%
Since only B is working,days required for him to complete the balance work=55%/4% per day
=13.75 days=14 days
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