GWD-6-27

maxwell5858

Q27:

The sum of positive integers x and y is 77.  What is the value of xy?

(1)     x = y + 1

(2)     x and y have the same tens digit.

                  

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

我选的大案是A，因为条件2应该推断不出来XY是多少，他只说十位数相同，但是个位数还有很多可能性的，烦请哪位可以解释一下，谢谢

一直在路上

以下是引用maxwell5858在2008-5-17 16:21:00的发言：

Q27:

The sum of positive integers x and y is 77.  What is the value of xy?

(1)     x = y + 1

(2)     x and y have the same tens digit.

                  

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

我选的大案是A，因为条件2应该推断不出来XY是多少，他只说十位数相同，但是个位数还有很多可能性的，烦请哪位可以解释一下，谢谢

没错,十位数相同的是有很多,可是两者之和为77的就一种可能性,38和39..

maxwell5858

偶，原来是这样，没有进一步的分析这唯一的可能性，谢谢一直在路上