A and B work together but a leaves the job after 2 days how much of the work is still left
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(A+B)'s one day's work = 1/3 part;
(A+B) works 2 days together = 2/3 part;
Remaining work = 1-(2/3) = 1/3 part;
1/3 part of work is completed by A in two days;
Hence, one day's work of A = 1/6;
Then, one day's work of B = 1/3-1/6=1/6;
So, B alone can complete the whole work in 6 days.
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