作者wombat0914 (G神幫幫我)
看板GMAT
標題[機經] 9月 JJ Math
時間Mon Sep 15 01:19:24 2008
140. In a certain group of children, each children either has 3 pens and 1 pencil or has 1 pen and 2 pencils, if the average arithematic mean of pencil is 1.6, what is the arithematic mean of pen?
CD上答案是1.8
請問這答案是怎麼來的呢?
先謝過了!!
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