GRE考试

【单选题】

If x+y=a,y+z=b, andx+z=c, whatisthe average (arithmetic mean) of x, y, and z

网考网参考答案：D
网考网解析：
[*] **Use TACTIC 2, Chapter 11: substitute for the variables. Let x = 1, y = 2, and z = 3. Then the average of x, y, and z is 2. When a = 1 + 2 = 3, b=2+3 =5, andc= 1 + 3 = 4, which of the choices equals 2 Only [*] document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>