SAT数学Problem Solving练习题（24）

>>SAT考试：SAT数学Problem Solving练习题（24）

>>SAT考试辅导：精品课程高端指导

Question #9:

2·m - n = 4

m + 2·n = 12

Column AColumn B

(m + n)261

(a) The quantity in Column A is greater then the quantity in Column B.

(b) The quantity in Column B is greater then the quantity in Column A.

(c) The two quantities are equal.

(d) The relationship cannot be determined from the information given.

Answer: From the first equation, n = 2·m - 4. Then, the first equation will be m + 2·(2·m - 4) = 12

m + 4·m - 8 = 12 so 5·m = 20 and m = 4

From the first equation, n = 2·m - 4 = 2·4 - 4 = 4

Column A expression will be (m + n)2 = (4 + 4)2 = (8)2 = 64

The quantity in Column A is greater than the quantity in Column B.

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