甲、乙两位老板分别以同样的价格购进一种时装，乙购进的套数比甲多1/6，然后甲、乙分别按获得的80%和60%的利润定价出售。两人都售完后，甲比乙多得的利润恰好能让他再购进这种 时装9套，则乙原来购进这种时装多少套？

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