【GMAT考满分数学PS题库】The ratio of zinc to copper in X is 5:7, and the r_真题_答案_解析 GMAT考满分官网

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题目内容

The ratio of zinc to copper in X is 5:7, and the ratio of zinc to copper in Y is 8:7. Mix the equal amount of X and Y to produce a new mixture of Z. What is the ratio of zinc to copper in Z ?

A63:57
B37:63
C27:57
D19:21
E41:63

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正确答案: D

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