[計量] 兩題有關GMAT problem solving的問題

[skiptomylou3 (一條寂寞又無助的道路)]

　
　因為這兩題是從對岸的一本書叫做"GMAT 匯編"上面看到的，
　所以不知道標題要寫什麼，所以如果有需要更改標題的再麻煩告知!

  1.Month    Average price per Dozen
    April     $1.26
    May       $1.20
    June      $1.08

  The table above shows the average (arithmetic mean) price per dozen
  of the large grade A eggs sold in a certain store during three
  secessive months.If 2/3 as many dozen were sold in April as in May,
  and twice as many were sold in June as in April . What was the average
  price per dozen of the eggs sold over the three-month period?

  (1) $1.08
  (2) $1.10
  (3) $1.14
  (4) $1.16
  (5) $1.18     Ans:D
　
　第一題感覺應該要設x和y，但完全沒有頭緒要把x,y設在哪?

  2. If y =/= 3 and 3x/y is a prime integer greater than 2, which of the
  following must be true?

  I.   x=y
　II.  y=1
　III. x and y are prime integers.

  (A) None
  (B) I only
  (C) II only
  (D) III only
  (E) I and III  Ans:A

  第二題我的答案是(E)，但讓我很模糊的是甚麼叫做prime integer?
  用google查prime integer得到"素數"，然後用wiki查感覺更不清楚
　
　麻煩大家了~謝謝!
　
　
　



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◆ From: 118.167.184.214
推 hitachil:prime integer是質數吧?
→ Bballer:樓上正姐
→ jamlco:原Po OG做完了嗎　做完應該知道是質數><
修個文，我補來欣，然後來欣要這裡拜或下禮拜才發，但我想早點開始動作
所以就先開始算! 抱歉!問這麼白癡的問題　　　　　　
※ 編輯: skiptomylou3    來自: 118.167.184.214      (02/17 20:04)
※ 編輯: skiptomylou3    來自: 118.167.184.214      (02/17 20:05)