a can do a piece of work in 4 days and B can do the same work in 5 days find how much work can be done by them working together in first oneday second second days and what part of work will be left after they have worked together for 2 days
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Step-by-step explanation:
A can do work in 1 day =1/4
B can do work in 1 day =1/5
both can do work in 1 day=1/4+1/5 = 9/20
work done by both in 2 days = 2 X9/20 =18/20
as total work done is 1 so after 2 days work left would be 1-18/20=2/20
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