GMAT 考满分题库

- 数学PS -
The ratio of zinc and copper in X is 5: 7, and the ratio of zinc and copper in Y is 8: 7. After mixing the same amount of X and Y, what is the ratio of zinc and copper in the new mixture?
  • A63:57
  • B19:21
  • C20:21
  • D19:20
  • E57:64
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正确答案: B

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