GWD-6-27

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.

这里（2）中，x,y有相同的十位数有很多，如（31，36），（32，35），（33，34），都满足x+y=77,答案为什么是d呢？？看过解答帖说只能是 38，39，为什么？那不就把俩条件加一起了

题干里有条件：X+Y=77,X,Y都是整数。你举的例子没有1个X+Y=77满足题干，你抖是67

只有38，39满足