天津丰田合成:math!!!!!!math!!!!!!!!
来源:百度文库 编辑:中科新闻网 时间:2024/05/21 21:18:20
The ratio of boys to girls in a senior class is 5:3. If 9/10 of the boys may graduate and all the girls may or may not graduate, what is the maximum part of the senior class that may graduate?
maximum part=[5*9/10+3] /(3+5)= 15/16
5/(5+3)*(1-9/10)=1/16