X alone can do a work in same time in which Y and Z do it together. If X and Y do it together in 20 days, and Z alone in 100 days, then in how many days can Y alone do it?
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X alone can do a work in same time in which Y and Z do it together. If X and Y do it together in 20 days, and Z alone in 100 days, then in how many days can Y alone do it?