Number of days A required do a piece of work : 16
Number of days B required do a piece of work : 12
Work done by A in one day:
Work done by B in one day:
A works alone for 2 days, so work completed by A in 2 days : =
Work left =
Work done by A and B together in one day: =
They can do the work together in days .
But th of the work is done by both A and B
Time required to complete th of the work together by A and B : 6 days
Time taken to finish the work 6 + 2 = 8days ( here 2 is added because work is done by A alone).
Total time taken to finish the work: 8days
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