标题: JJ 问题 [打印本页]
作者: hytseng 时间: 2002-10-18 14:54 标题: JJ 问题
16、DS
The number of boys in a class and the number of the total of boys and girls who take the course of biology is shown in the form blew, How many is all the boys and girls in the class.
表格
boy 28
girl
total 36
1. There are 3 boys who do not take biology
2. The girls in the class is twice as many as the totle of boys and girls who do not take biology
C
一直算不出来 ， 觉得是 E
4. To go a 405 miles trip, a car can go 36 miles per gallon for gasoline A , and for gasoline B, the efficiency decreased by 1/3 of A, ask during this trip, the car can save how many gallon of gasoline A for whole trip than it uses gasoline B?
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405/72
我的算法
405/12 - 405/36 = 22.5
[em26][em26][em26][em26][em26]
[此贴子已经被作者于2002-10-18 14:53:03编辑过]
[此贴子已经被作者于2002-10-18 14:54:04编辑过]
作者: Kilroy 时间: 2002-10-18 15:03
选C
设总共GIRL为X人，NO-BIOLOGY GIRL为Y人
X=2（3+Y）
36-（28-3）+Y=X
得出X=16人，总人数为16+28=44人
作者: michaelwu64 时间: 2002-10-18 15:35
4.我想“....the efficiency decreased by 1/3 of A” 的意思应是(1-1/3)*36=24。所以妳的算式应修正为405(1/24-1/36)=405/72
作者: ruthy_yin 时间: 2002-10-18 15:43
16选B,我在以前的贴子里和tongxun讨论过
x=2(x+28-36) => x=16
作者: hytseng 时间: 2002-10-18 18:07
ruthy_yin...
x=2(x+28-36) ??
What does X stand for ?
作者: Kilroy 时间: 2002-10-18 22:41
为什么可以X2？
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