GWD-1-26

lololo

Q26:

If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?

(1) The tens digit of k + 9 is 3.

(2) The tens digit of k + 4 is 2.

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.

the answer is A, but why? Please help me! thanks

sammen

这个我也想步明白，希望NN们指教了。

mikejia

3位数的个位数非零。

+9会进位，由条件1 => 原来十位数为2。

由条件2）=> 原来十位数可能是2也可能是1； 比如：123， 118。