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求解答，PREP1， 数学61
61、of the 60 animals on a certain farm,2/3 ar-e either pigs or cows. how many of the animals are cows?
(1) the farm has m-ore than twice as many cows as it has pigs
(2) the farm has more than 12 pigs
我的理解是，就是cow+pig是四十只，so1对，2不对。
但是答案是C。。。
谢谢！！！ |
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