新
If x is the average (arithmetic mean) of m and 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m?
A . m+6
B . m+7
C . 2m+14
D . 3m+21
答案解析
Choice В is correct.
以下为新SAT OG Test04 数学 Section4 Q29真题，考察大家对于代数和函数相关知识的掌握，这类知识点是每次考察重点，也经常会出难题。考生把这部分知识融汇贯通，明确知识点之间的内在关系，是获得高分的保证。
相关推荐：