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  3. In a sample of patients at an animal hospital, 30 percent are cats and 60 percent are not dogs. What fraction of those patients

In a sample of patients at an animal hospital, 30 percent are cats and 60 percent are not dogs. What fraction of those patients

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问题 In a sample of patients at an animal hospital, 30 percent are cats and 60 percent are not dogs. What fraction of those patients who are not cats are dogs?
选项 A、 
B、 
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D、 
E、 
答案E
解析 For simplicity, assume that there are 100 animals. Of these 30 are cats and 70, therefore, are not cats. If 60 percent of the animals are not dogs, then 40 percent are dogs. If 40 of the noncat animals are dogs, then 4/7 of those patients who are not cats are dogs.
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