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.
答案是C,但是我觉得两个合起来也求不出来啊!其实这题读的都有点模糊,题目给出了40只动物是猪或者牛?作者: Wangycbest 时间: 2011-7-19 21:21
(1) the farm has more than twice as many cows as it has pigs.
这个选项的意思是说 牛比猪的数量的两倍还多么?
我的理解是 牛的数量比猪多两倍 也就是牛是猪的三倍
more than twice as many as 是什么意思?我可能是SC做晕菜了。。作者: zm_patrickS 时间: 2011-7-21 06:37
已知:
P>12
C+P=40
C>2P
所以:
将第三个带入第二个
3P<40,则P<13.333
综合第一个条件,则只有P=13
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