If w = x + y + z,what is the average (arithmetic mean) of w,

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If w = x + y + z,what is the average (arithmetic mean) of w,x,y,and z in terms of
(A) w/2
(B) w/3
(C) w/4
(D) w/6
(E) w/8
A ,B.很遗憾,本题共有98人作答,正确率54.00%,包含知识点【方程式】
在Satonline上面的一道SAT数学题目,这题没有看懂!给翻译下好吗?

如果w=x+y+z,那么对于w,x,y,z这四个数的平均数怎么用w的代数式表达?
平均数=（w+x+y+z）/4=2w/4=w/2
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