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TTGWD1-18/1-30谢谢拉

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发表于 2006-7-24 13:23:00 | 显示全部楼层

TTGWD1-18/1-30谢谢拉

TTGWD-1

Q18:

 

 

     
               
   
           x

 

 

 

 

   x                 2 in          x

                                                          

 

 

 

 

      

             x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


                                        

                                    Note: Figure not drawn to scale.

 

 

The figure shows a square patio surrounded by a walkway of width x meters.  If the area of the walkway is 132 square meters and the width of the patio is 5 meters greater than the width of the walkway, what is the area of the patio, in square meters?

 

 

A.      56

B.      64

C.      68

D.     81

E.      100

不知道为什么B,谢谢拉


 楼主| 发表于 2006-7-24 13:31:00 | 显示全部楼层

Q30:

Joanna bought only $0.15 stamps and $0.29 stamps.  How many $0.15 stamps did she buy?

(1)     She bought $4.40 worth of stamps.

(2)     She bought an equal number of $0.15 stamps and $0.29 stamps.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是D ,是不是应该A

发表于 2006-7-24 13:39:00 | 显示全部楼层

u may use the searching engine to locate all the discussion links related to this question.

i calculated above question this way:

1) through walkway area's equation to find x.

 4 small squares = x*x*4=4x^2

 2 rectangulars'area = x*(x+5)*4=4x^2+20x

sum it all: 4x^2+4x^2+20x=132

             x=3

(3+5)^2=64 so patio's area is 64,therefore, b is the correct answer.

发表于 2006-8-28 07:19:00 | 显示全部楼层

or: the outside square minus the inside square equal to 132

(x+5+2x)^2 - (x+5)^2 = 132   => x=3

发表于 2009-5-6 11:25:00 | 显示全部楼层
第18题的原图是不是有差错?为什么walkway右边的宽度标成了"2 in"? (我下载的文档中就是如此)
发表于 2009-6-7 23:30:00 | 显示全部楼层

看不懂那2in是什麽。。。

发表于 2009-10-12 17:51:00 | 显示全部楼层
我也想问那个2 in 是什么。。。
发表于 2011-2-19 06:57:41 | 显示全部楼层
根据题目文字所述,我觉得原图的2in 是多余的。算法是:
(3x+5)^2-(x+5)^2=132, 因式分解得x=—11/2 或 3
取x=3,
所以patio的边长为X+5=3+5=8,
patio 的面积为 8^2=64, 选B
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