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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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题意就是x在450到550之间，y在350到450之间。当条件一成立，x范围为450到500之间，则x+y 的范围为800到950之间。可知结果可为800或者900.若条件二成立，则y的范围在350 到400之间，则则x+y 的范围为800到950之间，同样不足以退出答案。若两个条件同时成立，则x+y 的范围为800到900之间，任然不知道x+y是里800近还是离900近
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