a and b can do a work together in 35 days. a do 5/7 part of work and rest of part done by b. so work completed in 90 days. how many days a can do this work alone?
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A and B can do a work in 35 days.
A does 5/7 part of the work in, and b does 2/7 part of the work.
The work is completed in 90 days.
Therefore, A + B does 1/35 work in a day.
So A in 90 days A does 5/7 of the work.
Therefore in 1 day, A does 5/7 X 90 works.
Therefore A completes the work in 126 days alone.
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