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标题: GWD-12-3 [打印本页]

作者: thinkers    时间: 2005-4-9 10:18     标题: GWD-12-3

What is the remainder when the two-digit, positive integer x is divided by 3 ?

(1) The sum of the digits of x is 5.

(2) The remainder when x is divided by 9 is 5.

答案是A, 我觉得是D. 请大家帮助看看.


作者: sammen    时间: 2005-4-9 20:26

被9除余5的2位数,有14,23,32,41,50,59,68,77,86,95,可以发现个特点,就是这些2位数的数字合除以3的时候都余2,那么这些被除数除以3的余数也该是2。




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