307. (DS) is the median salary of 21 teachers less than the average: 1. the average salary is 445,200 2. the 12 of the leachers, each earn less than 21,000
是选C吗?
308. (DS)Two concerts, x and y. what is y? a inequality was given but cant remember what was the inequality 1. 20x+15y>320 2. X=3/4y
选E?
232. 1到9,九个数字,a是其中之一,再选2个(x和y),组成axy,xay,xya,yax,yxa,ayx,6个数字不相同的三位数,从小到大排列,此时xay最大,问xy各是多少。 1)2x+y=13 2)x^2什么的, ? 233. 40个人,60%的人参加A 30%的人参加B, 问既a又b的多少, 1)一共35(不确定,但不是40)个人参加了ab, 2)有5个没参加AB ?  |