2015年6月12日SAT官方每日一題

2015/06/12 來源:互聯女王 瀏覽次數:6 收藏
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  2015年6月12日SAT官方逐日一題

  標題範例:Mathematics > Standard Multiple Choice

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

  A geologist has 10 rocks of equal weight. If 6 rocks and a 10-ounce weight balance on a scale with 4 rocks and a 22-ounce weight, what is the weight, in ounces, of one of these rocks?

  (A) 4

  (B) 5

  (C) 6

  (D) 7

  (E) 8

  謎底:C

  【剖析】

  Let r equal the weight of each rock, in ounces. The weight on one side of the scale is 6r+10 ounces and the weight on the other side is 4r+22 ounces. Since the two weights balance, you can write the equation 6r+10 =4r+22. Solving this equation yields r=6.

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