弱问一个数学描述和一道DS题

kakadinho · 发表于 2011-1-10 01:10:43

从数学上说， at least 应该不等于 greater than吧？

为何下面这个题选C呢，我怎么看怎么觉得选E。。。求指点
During July, a mail order retailer received 3300 order for amounts less than $100, and 1100 orders for amounts of at least $100. what was the average size of an order in July?
(1) The gross sales from the orders less than $100 equaled the gross sales from the orders greater than $100
(2) The orders for less than $100 account for a total of $134000 in gross sales

sdcar2010 · 发表于 2011-1-10 01:55:04

$X : total $ for orders <$100
$Y: total $ for orders =$100
$Z: total $ for orders >$100

Stimulus give the # of orders for $X and the # of orders for ($Y + $Z)

1) X = Z
2) X= 134,000

So combining 1) and 2), you get X=Z= 134,000. But we still do not know Y.

LZ is right. Choose E.

kakadinho · 发表于 2011-1-10 02:12:45

THX，所以说题目混淆了at least和greater than。

确认一下踏实多了。12号考试，参观别人家的小狗狗中，顺便祝所有1月G友好运

弱问一个数学描述和一道DS题

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