考生如果觉得复习gre数学考试比较难不妨从这些题目练习开始，每篇都是按照分类给大家列举了一些典型题目，本篇主要是针对gre数学考试几何题型方面的典型题目及答案。

　　26.Three solid cubes of lead, each with edges 10 centimeters long, are melted together in a level, rectangular shaped pan. The base of the pan has inside dimensions of 20 centimeters by 30 centimeters, and the pan is 15 centimeters deep. If the volume of the solid lead is approximately the same as the volume of the melted lead, approximately how many centimeters deep is the melted lead in the pan?

　　A.2.5

　　B.3

　　C.5

　　D.7.5

　　E.9

　　答案：C

　　27.In the figure above, if x, y, and z are integers such that x