A can
de work in 15 days and Bin 20
days It they work on it together for 4 days
then the fraction of the work that is left is
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Answer:
Take LCM of 15 and 20 as the total amount of work which is 60 units in this case.
A can do work in 15 days therefore amount of work done by A in 1 day is 60/15 = 4 units
B can do work in 15 days therefore amount of work done by A in 1 day is 60/20 = 3 units
Total amount of work done in 1 day =A work of 1 day+B's work of 1 day=4 units +3 units=7 units
Amount of work done in 4 days =4*7=28 units
Amount of Work Left = 60–28=32 units
Fraction of work left = Amount of work left/ Total Work = 32/60 = 8/15.
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