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题库 / Prep2007E2-DS-156
Each of the numbers w, x, y, and z is equal to either 0 or 1. What is the value of w + x + y + z ?
(1) ~$\frac{w}{2}+\frac{x}{4}+\frac{y}{8}+\frac{z}{16}=\frac{11}{16}$~
(2) ~$\frac{w}{3}+\frac{x}{9}+\frac{y}{27}+\frac{z}{81}=\frac{31}{81}$~
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
读题不仔细， w, x, y, and z is equal to either 0 or 1是说这四个字母可能等于0或者1.。。
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