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主题：[The Official SAT Question of the Day™] January 15th Thursday
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Alice bought m pens for n dollars each, and Ben bought n pens for m dollars each. Which of the following is the average price per pen, in dollars, for all the pens that Alice and Ben bought?
A. 
B. 
C. 
D. 
E.  |
SAT题目：http://apps.collegeboard.com/qotd/question.do
楼主 Date: 2009-01-15 13:56:17
. The total number of pens they bought is 
. So the average price per pen will be 
. 
