请教GMAT OG13 Diagnostic test数学第5题

jzhq006 · 发表于 2012-8-23 17:08:46

A closed cylindrical tank contains 36π cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 2 feet. When the tank is placed on its side on level ground, what is the height, in feet, of the surface of the water above the ground?
答案是 3

我的理解是：圆柱装了一半容积的水，这些水是36π.（所以圆柱72π的体积）把圆柱竖立圆面朝下，水高2（所以圆柱高4，底面积18π，半径是3根号下2）。

是我哪里理解错了吗……？求详解。
OG给的答案是
V=π (r^2) h
36π=π (r^2) 4
所以r等于3

jzhq006 · 发表于 2012-8-23 18:38:28

自己顶啊

bb1447 · 发表于 2012-8-23 19:28:52

LZOG12版这个题条件就是4.可能是印刷的问题？

wulaoshi · 发表于 2012-8-23 23:13:50

题目印错了

jzhq006 · 发表于 2012-8-24 12:37:44

谢谢！

jzhq006 · 发表于 2012-8-24 12:38:09

谢谢！

gwen2486 · 发表于 2013-8-29 22:03:19

非常感谢！

请教GMAT OG13 Diagnostic test数学第5题

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