At the end of the semester, the teacher bought 72 exercise books, 48 pens and 57 erasers, and distributed them equally to each good student. twice the number, how many good students are there?
学期结束时，老师买来了72本练习本、48支笔和57块橡皮，将它们平均分给每个三好生，余下的练习本数是橡皮数的3倍，余下的笔的支数是橡皮数的2倍，一共有多少名三好生？
<result>11</result>