how to solve this DS?

huasing007 · 发表于 2007-10-28 13:03:00

question:
If x is a positive number less than 10, is z greater than the average (arithmetic mean of x and 10?

(1) on the number line, z is closer to 10 than it is to x
(2) z = 5x

Answer A.

But i cannot understand. This question come from PREP.

lisy · 发表于 2007-10-28 14:06:00

就是问Z和（x-10)/2谁大

条件1可以得到，Z-X〉10-Z因为已经知道他们都是正书，所以推出Z>（x-10)/2

条件2不能推出

所以选A

CindyFarer · 发表于 2007-10-28 16:09:00

为什么是x-10呢.不是算术平均数吗?

z在10的左边或右边也不一定啊

huasing007 · 发表于 2007-10-28 16:28:00

我也很疑惑，反正不明白

how to solve this DS?

how to solve this DS?

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