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标题: 请教几道GMATPrep的math [打印本页]
作者: Dinaxie    时间: 2006-8-30 19:49
标题: 请教几道GMATPrep的math

According to the derections on a can of frozen organge juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make organge juice. How may 12-ounce cans of the concentrate required to prepare 200 6-ounces serving of orgage juice

25    34    50   67   1000

ans:25

题目不懂

作者: Dinaxie    时间: 2006-8-30 19:51

susan drove at an average speed of 30 miles per kilemeter for the first 30 miles of a trop and then at an average speed of 60 m/k for the remaining 30 miles of the trip. what was S's average speed entire trip?

25   40    45   50   55

mine:45   ans:40

why?

作者: Dinaxie    时间: 2006-8-30 19:55

a certain library assesses fines for overdue books at follows. One the fisrt day that a book is overdue, the total fine is 0.1$. For each additional day the book is overdue, the total fine is either increased by 0.3$ or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue.

0.6      0.7       0.8     0.9    1

mine:0.9   ans:0.7

why?

作者: caterpillarcn    时间: 2006-8-30 19:56

concentrate : water = 1:3, 问需要多少cans of 12-ounce的concentrate来对200cans of 6-ounce的orange juice.
(200*6*1/4)/12=25

作者: Dinaxie    时间: 2006-8-30 21:41
以下是引用caterpillarcn在2006-8-30 19:56:00的发言：

concentrate : water = 1:3, 问需要多少cans of 12-ounce的concentrate来对200cans of 6-ounce的orange juice.
(200*6*1/4)/12=25

才明白concentrate为浓缩物，这个地方6-ounce与12-ounce究竟是什么东东？
作者: lovelyvans    时间: 2006-8-31 00:00
以下是引用Dinaxie在2006-8-30 19:51:00的发言：

susan drove at an average speed of 30 miles per kilemeter for the first 30 miles of a trop and then at an average speed of 60 m/k for the remaining 30 miles of the trip. what was S's average speed entire trip?

25   40    45   50   55

mine:45   ans:40

why?

speed=s/t=(30miles+30miles)       

               [(30miles/30)+(30miles/60]

作者: Dinaxie    时间: 2006-8-31 15:43
以下是引用lovelyvans在2006-8-31的发言：

speed=s/t=(30miles+30miles)       

               [(30miles/30)+(30miles/60]

真是糊涂，我居然用了求平均数的公式

作者: Dinaxie    时间: 2006-8-31 15:44
以下是引用Dinaxie在2006-8-30 19:55:00的发言：

a certain library assesses fines for overdue books at follows. One the fisrt day that a book is overdue, the total fine is 0.1$. For each additional day the book is overdue, the total fine is either increased by 0.3$ or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue.

0.6      0.7       0.8     0.9    1

mine:0.9   ans:0.7

why?

还有一道题，帮忙啊！
作者: rainnyxl    时间: 2006-9-15 12:49
以下是引用Dinaxie在2006-8-30 19:55:00的发言：

a certain library assesses fines for overdue books at follows. One the fisrt day that a book is overdue, the total fine is 0.1$. For each additional day the book is overdue, the total fine is either increased by 0.3$ or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue.

0.6      0.7       0.8     0.9    1

mine:0.9   ans:0.7

why?

我的答案是0.8雅,

超期的天数:                          1         2         3        4

方法一double)                 0.1      0.2      0.4      0.8

方法二0.1+(n-1)*0.3)       0.1      0.4      0.7      1.0

有谁可以帮忙看看嘛?

作者: Lucy26    时间: 2006-9-15 17:40

1:3

1+3=4

12X*4=200*6

X=25





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