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标题: [讨论]一道模拟题 [打印本页]

作者: pite123 时间: 2005-9-5 12:53 标题: [讨论]一道模拟题

of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cows?

1)The arm has more than twice as many cows as it has pigs

2) the farm has more than 12 pigs

我选A,可是答案给的C.

可是从1已经知道牛占大部分，根据题干不就是牛占2/3， 40头吗？请大家讨论一下

作者: excellences 时间: 2005-9-6 05:59

2/3 或者牛或者猪。即 40头。
A）牛和猪的数量比大于2 比例不定，得不出。
B）同样。
A+B 列等式：
P+C＝40 P>12，
得出：P＝13

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