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题库 / Prep2007E2-DS-155
If 500 is the multiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y, which multiple of 100 is closest to x + y ?
(1) x < 500
(2) y < 400
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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mark，不等式。
“500 is the multiple of 100 that is closest to x”转换为不等式就是“450≤x＜550”
“400 is the multiple of 100 that is closest to y”转换为不等式就是“350≤y＜450”
∴ 如果（1）成立，则450≤x＜500，800≤x+y＜950，无法确定其multiple of 100是800还是900
如果（2）成立，则350≤y＜400, 800≤x+y＜950，无法确定其multiple of 100是800还是900
如果（1）+（2），则800≤x+y＜900，依然不知道该数是距离800近还是900近。
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