！求助一道prep的DS

zby862001 · 发表于 2006-11-23 16:09:00

Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cow?
1) The farm has more than twice as many cows as it has pigs.
2) The farm has more than 12 pigs.

mike800101 · 发表于 2006-11-23 16:12:00

mymengming · 发表于 2006-11-23 16:23:00

以下是引用zby862001在2006-11-23 16:09:00的发言：

Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cow?
1) The farm has more than twice as many cows as it has pigs.
2) The farm has more than 12 pigs.

p+c=40

（1）C》2p

（2）p》12

若p=13

c>26

13+26=39

所以选C

c=13，p=27

zby862001 · 发表于 2006-11-23 17:22:00

！求助一道prep的DS

！求助一道prep的DS

所属分类: GMAT考试

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