X and Y together can complete a work in 12 days. X alone can complete in 20 days. If Y does the work only half a day daily, then in how many days X and Y together will complete the work?
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X and Y together can complete a work in 12 days. X alone can complete in 20 days. If Y does the work only half a day daily, then in how many days X and Y together will complete the work?