Nearly 90 people took part in an exam. In the test results, (1/6) people got "excellent", (3/7) people got "good", (1/3) people got "medium", and the rest got "good". Poor, then how many people got "poor" in this exam.
将近90人参加某次考试，考试结果有(1/6)的人得"优"，(3/7)的人得"良"，(1/3)的人得"中"，其余的得差，那么这次考试得"差"的人数是多少人．
<result>6</result>