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我觉得这个题有问题啊,你不可以assume那两个took cards的量是相等的哎,因为20 percent of a ship's passengers held round-trip tickets and also took their cars broad the ship,那如果没有round-trip T的人里也有take cads的呢,是我理解的太复杂了还是题干本身就有点问题啊,不知道LZ怎么个理解法。。。我老是把问题复杂化,哎 |
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