1. 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 two twice as many cows as it has pigs.
（2）The farm has more than 12 pigs.
答案 c
那个2是什么意思呀，我们怎么觉得是D呢。
2.Is the integer n odd?
(1)n is divisible by 3
(2)2n is divisible by twice as many as positive integer as n
答案 B
还是看不懂题目意思作者: congcircle 时间: 2010-5-10 21:35
求解，，急等
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