When Guangming Middle School evaluates students' grades for a certain subject, it records the average score of the various test scores of the subject in a school year into the file. When a student scored 97 points in the last test of the seventh grade, his school year score is 90 points; when his last test score is 73 points, his school year score is only 87 points. So, how many times did this student take the subject test in the seventh grade?
光明中学评定学生某科的学年成绩时，是以一学年来该学科的各次考试分数的平均分数记入档案．当某学生七年级最后一次考试得分为97分时，则他的学年成绩为90分；当他最后一次考试得分为73分时，则他的学年成绩只有87分．那么，这个学生七年级参加该学科考试的次数为多少
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