The number of stamps that kaye and albeto had were the ratio 5:3, respectively. After kaye gave alberto 10 of her stampes, the ration of the number kaye had to number alberto had was 7:5, as a result of this gift, kaye had how many more stamps than alberto?
20 30 40 60 90 答案给的是40,可是我算出来kaye有150,alberto有90,得出60。不知道自己是哪里出错了,难道真的是大脑出了问题,这么简单的计算都算不出来了? |