GMAT
题目
The number of stamps that Kaye and Alberto had were in the ration of 5:3 respectively. After Kaye gave Alberto 10 of her stamps, the ration of the number of Kaye had to the number of Alberto had was 7:5. As a result of the gift, Kaye had how many more stamps than Alberto
解析
已知：\( \frac{K}{A} = \frac{5x}{3x} \)（其中\( x \)是正整数），且\( \frac{5x-10}{3x+10} = \frac{7}{5} \)→解得\( x = 30 \)→因此\( K = 150 \)，\( A = 90 \)。
问题：\( (K - 10) - (A + 10) =？ \)→计算得\( (K - 10) - (A + 10) = 40 \)。
答案：C
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