2. 外语
  3. Each of Questions 1 to 7 presents two quantities, Quantity A and Quantity B. Compare the two quantities. You may use additional

Each of Questions 1 to 7 presents two quantities, Quantity A and Quantity B. Compare the two quantities. You may use additional

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问题 Each of Questions 1 to 7 presents two quantities, Quantity A and Quantity B. Compare the two quantities. You may use additional information centered above the quantities if such information is given. Choose one of the following answer choices:
A if Quantity A is greater;
B if Quantity B is greater;
C if the two quantities are equal;
D if you cannot determine the relationship based on the given information.

选项 A、 
B、 
C、 
D、 
答案D
解析 The correct answer is D. To solve this problem, pick values for r and substitute them into each equation. For example, when r=200, r-125 = 75, and 300-r=100. In this case, Quantity B is greater. However, when r=300, r-145 = 155, and 300-r=0 and Quantity A is greater. You cannot determine a relationship between the two quantities.
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