GWD-12-3

thinkers

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.

sammen

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。