求GWDMath第二套的9，18，29，30，36

mu1huizi

Q9:

What was the price at which a merchant sold a certain appliance?

(1)   The merchant’s gross profit on the appliance was 20 percent of the price at which the merchant sold the appliance.

(2)   The price at which the merchant sold the appliance was $50 more than the merchant’s cost of the appliance.

                  

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.

本人不理解的是既然没有告诉确切的数，为什么还能得出price呢？是不是只要能列出式子就行？

Q18:

On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship.  If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

 

A.     33 1/3%

B.     40%

C.     50%

D.     60%

E.      66 2/3%

这题A和D的答案没看懂，望高手指教！

Q29:

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?

 

A.  424

B.  433      

C.     440

D.     449

E.      467

Q30:

 

In the figure, each side of square ABCD has length 1, the length of line segment CE is 1, and the length of line segment BE is equal to the length of line segment DE.  What is the area of the triangular region BCE?

 

A.     1/3

B.     (Ö2)/4

C.     1/2

D.     (Ö2)/2

E.      3/4

因为图实在是贴不上来，见谅~

Q36:

What is the median number of employees assigned per project for the projects at Company Z?

(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.

(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

                  

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.

这是我的软肋，一直搞不清楚中数的性质。有的题目又有通过中数推断平均数的，希望大牛解答！

cytlc1978

Q9:条件1：利润是售价的20%；条件2：售价比成本多50元。两个条件综合起来自然得到售价为250

cytlc1978

Q18：20%/（1-60%）=50%。A的意思是33.3%，D的意思是66.7%

cytlc1978

Q29：本题是求该数的各位数字之和。这个数是个50位数，前48位都是9，十位是2，个位是6。所以答案是：48*9+2+6=440

cytlc1978

Q30：看了原题。连接BD，并延长EC与BD相交于F,用BEF的面积减去BCF的面积即可。注意角BCF为45°。选B

cytlc1978

Q36：25%大于等于4，35%小于等于2，说明40%的projects有3个employees。中数的概念是：将数字从小到大排列，若总数为奇数，则中数为中间那个数；若总数为偶数，则中数为中间两个数的平均值。此题因为40%的值为3，所以两个条件和在一起可以确定中数为3

mu1huizi

谢谢啊， 您解答了我的疑惑！！！