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题库 / Prep2007E1-DS-65
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
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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x可能是介于0到1之间的数字，这样的话，x的五倍依然小于1
x等于8 z等于9的话 z距离x和10的距离是一样的 A要求closer 所以这种情况不成立
x=8 z=9 就不对啊 什么垃圾题
vegetable
那就是Z=平均数，依然是≥，符合条件
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