[求助]PREP里一题不理解中文意思

ElisaWang

看到PREP里一题不理解中文意思，那位看得懂的同学帮忙解释下？谢谢~

3. 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
Answer:
450<x<550, 350<y<450
Combined 450<X<500 and 350<y<400, we know that 800<x+y<900,but we still don’t
know which multiple of 100 is closest to x+y.
The answer is E.

[此贴子已经被作者于2009-3-23 21:52:18编辑过]

blueflower86

帮LZ顶一下。。

同问。。

fighting127

我觉得是500在100的倍数里是最接近X的数 就是说X四舍五入到500 X在(450,550) 同样Y在(350,450)所以条件都不满足

ElisaWang

明白了 谢谢fighting MM!