Melissa has 40 story books. Kevin has 20 more story books than Me

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Melissa has 40 story books. Kevin has 20 more story books than Melissa. What is the ratio of the number of Melissa’s story books to that of Kelvin’s?

答案：0.085417

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老师这题不是2/3吗？

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我算出是2:3，想问下答案的0.085是怎么算出来的

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