2015年11月9日SAT官方每日一題

2015/11/10 瀏覽次數:2 收藏
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  標題範例:Mathematics > Standard Multiple Choice

  Read the following SAT test question and then click on a button to select your answer.

  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

  謎底:D

  【剖析】

  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.