请教大家两道prep数学题，谢谢~~~

roxanne1988 · 发表于 2009-12-8 22:49:01

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

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

2 The farm has more than 12 pigs

STOCK	number of shares
V	68
W	112
X	56
Y	94

z

45

The table shows the number of shares of each of the stocks owned by Mr.Sami.If Mr Sami was to sell 20 shares of stock Xand buy 24 shares of stock Y,what would be the increase in the range of the numbers of shares of the 5 stocks owned bu Mr.Sami?答案是15

genius_fang · 发表于 2009-12-8 23:07:52

第一题：（1）说牛比猪的两倍还多，显然推不出具体有几头；（2）说猪至少13头，也推不出。但是和在一起的话，发现，如果猪13头，那么牛只能是27头，可以；若猪有14头，牛必须起码29头，就超过40头了，所以答案唯一：13头猪，23头牛。
第二题：现在的range是112-45=67；重新买卖后，最多的股票变成Y：118，最少的变成X：36，所以range变成82，所以increase就是82-67=15

roxanne1988 · 发表于 2009-12-8 23:15:57

哦，谢谢，明白了，我的数学简直无可救药了，prep 竟然是数学时间不够，verbal 还能提前做完，无语~~~~~~~~

genius_fang · 发表于 2009-12-8 23:23:46

呵呵，LZ是不是很早就去国外念书了？

roxanne1988 · 发表于 2009-12-8 23:25:17

保持沉默，呵呵，只是从小数学烂到大，惭愧

genius_fang · 发表于 2009-12-8 23:29:07

呵呵，没关系啦~~~看几天，搞定GMAT数学应该没问题的~看楼主的水平，V应该搞的定的！M上到49，50不难的！

请教大家两道prep数学题，谢谢~~~

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