GWD 27-15

gchen030

Q15:

 

+	x	y	z
d			m
e		n
f

 

 

The figure above shows two entries, indicated by m and n, in an addition table.  What is the value of n + m?

(1)
              d + y = -3

(2)
              e + z = 12

                  

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.

NN 请解释一下？ 谢谢

narcisuss

C?

因为m+n=d+e+y+z,所以1式加2式即可……

我数学非常次，请其他人判断。

piaolf123

以下是引用narcisuss在2008-12-13 12:00:00的发言：
C?

因为m+n=d+e+y+z,所以1式加2式即可……

我数学非常次，请其他人判断。

正确，答案为C

如图:m=d+z,n=e+y

条件1：
                d + y = -3，不能得出m+n的值  

条件2：e + z = 12，也不能得出m+n的值  

联立1，2可得m+n