GRE考试

【单选题】Directions for QuantitativeComparison Questions: Some of the following questions give you two quantities, one inColumn
A、and one inColumnB,Compare the two quantities and choose one of the following answer choices:

A、if the quantity inColumn
A、is greater;

B、if the quantity in column
B、is greater;
C．if the two quantities are equal;
D．if you cannot determine the relationship based on the given information

网考网参考答案：D
网考网解析：
To solve this problem, first translate the words into their mathematical equivalents, remembering that the average is the sum of the values divided by the total number of values: The average of a and b translates into [*] The average of [*] and 2b translates into [*] Simplify the values by using the distributive property as follows: Column A: [*] Column B: [*] Now use test values for a and b. Let a=4 and b=1. The quantity in Column A would equal 2.5 and would be greater than the quantity in Column B, which equals 2. Now let a=1 and b=2. The quantity in Column A would equal 1.5 and would be less than the quantity in Column B, which equals 2.25. Therefore, you cannot determine the relationship based on the given information. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>