请教一道Prep DS题，不懂题意。。。

zhepeking · 发表于 2011-1-30 12:37:49

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

sdcar2010 · 发表于 2011-1-30 12:52:25

It should read as:
If 500 is the multiple of 100 that is closest to x . . .

zhepeking · 发表于 2011-1-30 13:05:55

对对，我把第一个of 100抄漏了..... 这题翻译成中文是什么意思呀。。

sherrycc · 发表于 2011-1-30 13:07:00

closest to 应该是表示一个值域
总之prep答案是选E。。我昨天也做到过。。。

sdcar2010 · 发表于 2011-1-30 13:08:40

multiple of 100: 100, 200, 300, 400, 500, 600, . . .

Among the above candidates, 500 is the closest to x and 400 is the closest to y. Do you know which of the above numbers is closest to x+y?

sdcar2010 · 发表于 2011-1-30 13:17:22

Premise: 450<x<550 and 350<y<450

condition 1) 450<x<500, 800<x+y<950. The multiple of 100 could be 800, 900,
condition 2) 350<y<400, 800<x+y<950. The multiple of 100 could be 800, 900
conditions 1) and 2) 450<x<500, 350<y<400, 800<x+y<900. The multiple of 100 could be 800, 900.

sherrycc · 发表于 2011-1-30 13:30:43

哦我懂了。。谢谢楼上

请教一道Prep DS题，不懂题意。。。

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