If a and b togather can compilte a piece of work in 15 days and b alone in 20 days in how many says can a alone
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in 1 day, A and B do together = 1/15 work
in 1 day B alone does = 1/20
in 1 day, A alone does = 1/15 - 1/20 = 1/60
Hence A will take 60 days to complete it alone
in 1 day B alone does = 1/20
in 1 day, A alone does = 1/15 - 1/20 = 1/60
Hence A will take 60 days to complete it alone
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