请教3道Prep-01的题目

tracyforever

1) If X>Y^2>Z^4, which of the following statements could be true?
I) x>y>z
II) z>y>x
III) x<z<y

能举个例子为什么III对的么？

2) Last month 15 homes were sold in town X. The average (arithmetic mean) sale price of the homes was $150,000 and the median sale price was $130,000. Which of the following statements must be true?
I) At least one of the homes was sold for more than $165,000
II) At least one of the homes was sold for more than $130,000 and less than $150,000
III) At least one of the homes was solde for less than $130,000

为什么III不对？

tracyforever

继续

At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the positions of the people are different relative to each other. What is the total number of different possible seating arrangements for the group?

a) 5
b) 10
c) 24
d) 32
e) 120

The positive integer x,y,x are such that x is a factor of y and y is a factor of z. Is z even?
1) xz is even
2) y is even
答案是1，2都可以推出，为什么第一个可以阿？

tracyforever

顶起来！

小鱼good

弱弱的问一下，GMAT prep 数学是prep 模考软件里面带的题目吗？