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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.