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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
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