神马品牌网武安黑社会老大小海:math!!!!!!math!!!!!!!!
来源：百度文库 编辑：神马品牌网 时间：2024/04/30 09:50:33
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