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主题:[The Official SAT Question of the Day™] December 14th Sunday

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What is the sum of 5 consecutive integers if the middle one is 70?
A. 14
B. 75
C. 272
D. 330
E. 350
SAT题目:http://apps.collegeboard.com/qotd/question.do
楼主 Date: 2008-12-14 18:08:59
Hint : If you know that the 5 integers are consecutive, and you know the value of the middle one, then you can find the value of each of these integers. Once you know the integers, you can find their sum.
沙发 Date: 2008-12-14 18:09:36
Correct Answer: E
    • Here's Why: You can find the sum of the 5 integers if you know what the integers are. Since the integers are consecutive and the middle (third) one is 70, the integers must be 68, 69, 70, 71, and 72. The sum of these integers is 350.
      (If you notice that the sum is (70 – 2) + (70 – 1) + 70 + (70 + 1) + (70 + 2) = 5 · 70 = 350, then the calculation is even easier.)
    • Difficulty: Easy
    • Question Type: Standard Multiple Choice
      (Mathematics)
板凳 Date: 2008-12-14 18:10:29
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