国际顶尖MBA申请交流平台--TOPWAY MBA

标题: a math problem [打印本页]

作者: yang 时间: 2002-10-11 10:26 标题: a math problem

If a 2-digit positive integer has its digits reversed,
The resulting integer differs from the original by 27.
By how much do the two digits differ?
3/4/5/6/7

I have not idea how to resolve this problem.
Please "Da xia" help me.
[em24]

作者: sunstar 时间: 2002-10-11 10:45

Here is the way to solve it:

Suppose two digits integer is:ab
ab = 10a+b
ba =10b+a

ab-ba = 9(a-b)=27
==>a-b=3

作者: yang 时间: 2002-10-11 13:23

many thanks! Sunstar

作者: weiyizhuce 时间: 2002-10-11 13:35 标题: 寻G友

我准备1月份考GMAT，现在刚刚复习完以前的笔试题，还没做过模考软件，目前只能一周复习三天左右，不知时间够不够？请教各位“大虾”？

作者: tongxun 时间: 2002-10-11 13:44

只要有效率，应该可以。

作者: yang 时间: 2002-10-18 10:42

weiyizhuce

No problem,but it will also be decided by your pervious basis.

作者: sandwolf 时间: 2002-10-18 13:35

复习末期注意保持心理健康吧！
哈

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