Preeti can do a work in the same time in which Kanchan and Sudha together can do it. If Preeti and Kanchan work together, the work can be completed in 10 days. Sudha alone needs 50 days to complete the same work, then Kanchan alone can do it in how many days?

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Preeti can do a work in the same time in which Kanchan and Sudha together can do it. If Preeti and Kanchan work together, the work can be completed in 10 days. Sudha alone needs 50 days to complete the same work, then Kanchan alone can do it in how many days?