A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

Answers (1)

A can work in 15 days, so one day's work of A = 1/15th of work

B can work in 20 days, so one day's work of B = 1/20th of work

one day's work of A+B together = 1/15+1/20 = 7/60 th of work

4 day's work of A+B together = 4x7/60 = 7/15th of work

Hence remaining work = 1-7/15 = 8/15th of work.

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