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题库 / Prep2007E1-PS-69
The number of stampsthat Kaye and Alberto had were in the ratio 5 : 3, respectively. After Kaye gave Alberto 10 of her stamps, theratio of the number Kaye had to the number Alberto had was 7 : 5. As a result of this gift, Kaye had how manymore stamps than Alberto?
20
30
40
60
90
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K和A他们拿到邮票数量之比是：5：3；在K给了10张邮票给A之后，K和A之比：7：5. 问K比A多多少邮票？（前提是已经给了之后，还多多少张，一定要注意这句话）
K/A=5/3
K-10/A+10=7/5
解出：K=150 A=90 所以多60张 【此时不可以直接用 30*（7-5），因为x是给之前的每份的个数，给了之后这个变化了！！
所以150-10=K现有的140张
90+10=A现有的 100张
最后多40张
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