新型病毒蔓延，武汉某单位做疫情排查，发现疑似病例，所有人全部隔离观察，隔离观察之后有75%的被确诊，经过一段时间治疗之后又有20人被治愈，此时剩余未治愈的人数占公司总人数的50%，如果要把剩余的病人转到重症病房进一步治疗，每个病房最少2个人，且病房的人数都不相同，那么最多需要提前准备多少间病房？（ ）

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