Q23:
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.
我把n和m看成是平面上的两个点了，坐标分别是（y, e）,(z,d),所以要知道y+z和e+d的值才能求出n+m.我真的不明白题目的意思，请大师赐教！Thx! | 
