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？ | 
