Re: [計量] CAT test 11 12

看板GRE (GRE入學考試)作者bigjung (擁抱南台灣)時間16年前 (2009/11/21 21:38)推噓0(0推 0噓 0→)

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※ 引述《sqaure (sqaure)》之銘言： : test11: : 19. In 2002, McDonald's sold 20% more cheeseburgers than in 2001, and in 2002 : the price of each cheeseburger they sold was 10% more than in 2001. : The gross income from the sale of cheeseburgers was what percent greater : in 2002 than in 2001? : ans : 32% 你可以假設2001年賣X個漢堡一個Y元依題意可知2002年賣1.2X個,每個1.1Y元 2001年總共獲得 XY 元 2002年總共獲得 1.32XY 元所以2002年比2001年多賺了 32% : test 12: : 2. If p is the number on the number line between 2 and 20 that is twice as : far as from 2 as from 20, then p is? : ans : 14 : 想問想這種句型到底要怎麼分辨誰是誰的幾倍? 一定是"先"說得比"後"說得幾倍所以是到2的距離是到20的距離的兩倍依題意可知把線段分成三等分 (20-2)/3=6 p=2+6*2=14 : 5. If x and y are positive integers, and 30(x-2)=68(y+3), what is the least : possible value of x+y? : (a)38 (b)48 (c)68 (d)97 (e)98 : ans : 48(b) : 我找不出好方法，只好一個個答案代進去算了 : 請問有其他方法嗎? 先找出 30 68 最小公倍數 = 1020 因為他只有說possible value 你要從最小公倍數的倍數去找答案可能為最小公倍數的情況也可能不是但這題好像剛好是這個情況 (x-2)= 34 x=36 (y+3)=15 y=12 x+y=48 : 22. Each house number on Main Street has 4 digits, and all of them look : identical. Pan wants to play a visit to his friend, and he remenbers the : first 2 digits of his friend's address. However, he has forgotten the last : 2 digits. All Pat can make sure is that his friend's house number is odd. : If Pat chooses a house based on what he knows about the address, what is : the probability that Pat will coose his friend's house? : ans : 1/50 四位數前兩位數已知-->只有十位數和個位數不知而已就可以看成是0~99 挑中他朋友住的號碼又知道尾數是奇數可以刪掉偶數50個則挑中的機率就是 1/(99-0+1 -50 ) = 1/50 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.171.120.251