题目
A cuboid has dimensions 7 by 8 by x where x>8. A water tank is a cylinder with base area, a. The cuboid stays at the bottom when water is added. When the cuboid has the 8 by x face down,a volume,v,of water is added to the tank to adepth of 7,level with the top of the cuboid. When the cuboid has the 7 by x face down,the water level drops by 1. When the cuboid has the 7 by 8 face down,the water level again drops by 1. Find how much the water level drops when the cuboid is removed. 一个长方体的尺寸为 ，其中 。向一个底面积为a的圆柱体水箱中加水时，长方体始终位于其底部。当以长方体 的面为底面放置时，向水箱中加入体积为v的水，水位达到7，与长方体顶部齐平。当以长方体 的面为底面放置时，水位下降了1。当以长方体 的面为底面放置时，水位再次下降了1。求当长方体被移除后，水位下降了多少。 ——、、、
解答
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