最新提问
我的动态
登录后查看动态
题目内容双击单词支持查询和收藏哦～
A certain class of 90 students took a typing proficiency test. The average (arithmetic mean) score of the students who passed the test was 84, and the average score of the students who failed the test was 60. If the average score of all students was 80, how many students passed the test?
E显示答案
以上解析由 考满分老师提供。
