请教众位一题

rebeccatj

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.



A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer: D
真心不知道（1）是怎么选的

queenieshieh

就是说X这个数十位跟个位的数字加起来等于五。
那其实就只有14,41,23,32，50这5种可能~每种可能除以3的余数都是2啊~所以1也是sufficient的呀~

rebeccatj

就是说X这个数十位跟个位的数字加起来等于五。
那其实就只有14,41,23,32，50这5种可能~每种可能除以3的余数都是2啊~所以1也是sufficient的呀~

-- by 会员 queenieshieh (2012/4/21 13:49:54)

哦，原来是这样，我好二了!拿到题就只想着那种能被3整的数的各位数之和是3的倍数~没想到用这种，谢谢哦