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标题: TTGWD1-18/1-30谢谢拉 [打印本页]

作者: jessiebetty 时间: 2006-7-24 13:23
标题: 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

作者: jessiebetty 时间: 2006-7-24 13:31

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

作者: citicsbond 时间: 2006-7-24 13:39

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.

作者: merryqing2004 时间: 2006-8-28 07:19

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

(x+5+2x)^2 - (x+5)^2 = 132 => x=3

作者: stevexdx 时间: 2009-5-6 11:25
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)

作者: smartck 时间: 2009-6-7 23:30

看不懂那2in是什麽。。。

作者: Kyokay 时间: 2009-10-12 17:51
我也想问那个2 in 是什么。。。

作者: daiwen2010 时间: 2011-2-19 06:57
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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