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标题: GWD 21 20 [打印本页]

作者: hedgeforfun 时间: 2005-11-18 07:30 标题: GWD 21 20

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.

作者: himba 时间: 2005-11-18 20:42

Ans:E

pig+COW=20

2P+P〈=20，so P<=6,那COW就有可能是14，15，16。。。。，（1）不满足

（2）单独肯定不满足

（1）+（2）也不满足

作者: hedgeforfun 时间: 2005-11-19 21:08

thanks a lot !!!!

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