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标题: 求助！prep2-ds-11 [打印本页]

作者: pangpangshin 时间: 2011-1-13 07:08 标题: 求助！prep2-ds-11

What is the value of the positive integer m ?

(1)When m is divided by 6, the remainder is 3.

(2)When 15 is divided by m, the remainder is 6.

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给的答案如下！
【答案】B

【思路】

(1) m=6k+3 (k是整數),m有太多可能,不充分

(2) 15=m+6, m = 9,充分

可是我怎么觉得由（2）得出的应该是 15=cm+6这样的话，综合1和2 才能选出来，应该选C吧！
请大牛们指点~

作者: wahabirds 时间: 2011-1-13 20:54

When 15 is divided by m, the remainder is 6.

Therefore, m is bigger than 6 and smaller than 15. m is selected from 7, 8, 9, 10, 11, 12,13,14. Only 9 fulfills the requirement.

作者: pangpangshin 时间: 2011-1-14 07:03

哦，明白了！谢谢！

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