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yunhaoll

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

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

(2)    The farm has more than 12 pigs.

 

Answer C

问题：2/3是pig or cow 那么从(1)中牛多就说明2/3是牛，有40头牛呀？？

（2）没啥用呀

 

请教

ted810

2/3 are either pigs or cows

是说，2/3 是牛和猪。不是“要不是牛，要不是猪”的意思。

ted810

1＋2条件，推出，牛有27头，猪有13头

刚刚写错了，是推出牛27头。因为猪大于12头，只能等于13。大于13的话，猪和牛就超过40头了。

[此贴子已经被作者于2008-5-5 20:45:30编辑过]

graysytl

why not a?