A can do a piece of work in 7 days and b in 5 days. If they work together for 2 days, then what fraction of work is left?
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Take LCM of 7 and 5 as the total amount of work which is 35 units in this case.
A can do work in 7 days therefore amount of work done by A in 1 day is 35/7 = 5units
B can do work in 5 days therefore amount of work done by A in 1 day is 35/5 = 7units
Total amount of work done in 1 day =A work of 1 day+B's work of 1 day=7 units +5 units=12 units
Amount of work done in 42days =12×2=24 units
Amount of Work Left = 35–24=11 units
Fraction of work left = Amount of work left/ Total Work = 11/35 = 11/35.
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