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主题：[The Official SAT Question of the Day™] December 11th Thursday

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The sum, product, and average (arithmetic mean) of three integers are equal. If two of the integers are 0 and –5, the third integer is
A. –5
B. 0
C. 2
D. 5
E. 10

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SAT题目：http://apps.collegeboard.com/qotd/question.do

楼主 Date: 2008-12-11 20:46:16

jasontomonaga

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Hint : If numbers are multiplied and one of the numbers is 0, then the product is also 0. Since the sum, product, and average of the three integers are all equal, the sum and average are also 0.

沙发 Date: 2008-12-11 20:47:28

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Correct Answer: D

Here's Why: You have three integers, 0, –5, and x, whose sum, product, and average are equal. Since 0 is one of the numbers, the product is 0. So the sum and average are also equal to 0. Therefore, –5 + x + 0 = 0, and x = 5.
Difficulty: Medium
Question Type: Standard Multiple Choice
(Mathematics)

板凳 Date: 2008-12-11 20:48:55

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