m is two digit number and 2m is a three digit number,what is

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m is two digit number and 2m is a three digit number,what is the unit digit of m
RT是GMAT的数学题1.the unit number of 2m is 4
2.the unit number of m is the same as the tens number of 2m

虽然是很久之前的了,可能楼主已经不需要了,但正好看到,并且发现下面给的答案也没帮助,希望自己的回答对其他有疑问的人有点帮助,如果错误,请大家指正.
题目意思是：
m 是一个两位数,2m是一个三位数,m 的个位数是什么?
（1）2m的个位数是4
（2）m 的个位数和2m的十位数相同.
由（1）：2m的个位数是4,那么m的个位数可能是2 or 7,并不能确定
由（2）：很明显由（2）单独得不出结论,并且即使在（1）的条件下,m也可以为62（2m=124）or 87(2m=174) 这个数并不是确定的
因此选E

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