(359) SAT

There was a long line drawn; the farthest point to the left was marked P, the midpoint was marked Q, the farthest point to the right was marked R. The space between P and Q was marked x + y. The space between Q and R was marked 2x -y. The question was, "Segment PR is divided into two segments with lengths as shown above. If Q is the midpoint of PR, which of the following statements must be true?" We were asked to choose any one of five:
"x = 0,"
"x = 1/2y,"
"x =2/3y,"
"x = y,"
"x = 2y."

SAT: Scholastic Aptitude Test
midpoint：《数学》〔線分などの〕中点
space：《数学》空間◆ある公理群に従う要素または点の集合。
segment:《数学》線分

チーズバーガーズ―Cheeseburgers 【講談社英語文庫】

• 作者: ボブ・グリーン
• 出版社/メーカー: 講談社インターナショナル
• 発売日: 1997/04/01
• メディア: 文庫

―p.54, A Tersting Time

Let's solve this question.
PQ = QR
x + Y = 2x - y
x = 2Y　・・・・・・Ans.
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