G的数学题,
Amy'sgradewasthe90thpercentileofthe80gradesforherclass,ofthe100gradesfromanotherclass,19werehigherthanAmy's,andtherestwerelower,ifnoothergradewasthesameasAmy'sgrade,thenAmy'sgradewaswhatpercentileofthetwoclassescombined?
题意不懂,
那这个题目是讲什么啊?
不是求的百分数啊,答案是85th