刚才做了gwd数学6，有点受打击， 觉得数学部分的阅读要求好像比og高多了。

但是有几道题我挺有把握的也错了， 我想请大家帮我来看看，以便尽快把gwd数学部分的讨论答案献给chasedream

Q6:

The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?

A. 11

B. 15

C. 24

D. 27

E. 32Answer:gwdkeys:C

但是我觉得应该是D

Q7:

What is the value of │x + 7│?

(1) │x + 3│= 14

(2) (x + 2)2 = 169

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.

Answer: GWDKEYS

我的答案是C

Q8

The figure above represents a square garden that is divided into 9 rectangular regions with indicated dimensions in meters. The shaded regions are planted with peas, and the unshaded regions are planted with tomatoes. If the sum of the areas of the regions planted with peas is equal to the sum of the areas of the regions planted with tomatoes, what is the value of x?

A. 0.5

B. 1

C. 1.5

D. 2

E. 2.5

Answer: d

我的答案是C

Q17:

A driver completed the first 20 miles of a 40-mile trip at an average speed of 50 miles per hour. At what average speed must the driver complete the remaining 20 miles to achieve an average speed of 60 miles per hour for the entire 40-mile trip? (Assume that the driver did not make any stops during the 40-mile trip.)

A. 65 mph

B. 68 mph

C. 70 mph

D. 75 mph

E. 80 mph

Answer: d

MY KEYS IS C

Q11:

A certain business produced x rakes each month form November through February and shipped x/2 rakes at the beginning of each month from March through October. The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months form November through October?

A. 0.40x

B. 1.20x

C. 1.40x

D. 1.60x

E. 3.20x

Answer: c

这一道题我不会做所以选错了，请教：）

Q25:

If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?

A. 6

B. 5

C. 3

D. 1

E. 0

Answer: d

我觉得有三种情况N=1,4,7

Q28:

Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?

A. 100p / (125 – p)

B. 150p / (250 – p)

C. 300p / (375 – p)

D. 400p / (500 – p)

E. 500p / (625 – p)

Answer: d

这一道题我的答案和上面的都不一样，请教！

前几道题昨天已经讨论过

17 前20英里用时为X 20/X=50 X=2/5 总共用时40/60=2/3

那么后半程用时为2/3-2/5=4/15，后半程average速度为20/(4/15)=75

11 到二月有4X的货，三月3.5X，四月3X，...，八月0.5X，九月0

全加起来14X,所以是1.4X$

25 是有三种情况，但是答案里没有其它两种情况，所以你就选有的。

28 A卖了X，B卖了Y

(1X+1.25Y)×r%=1X

(X+Y)×p%=X

两个联立得出400p / (500 – p)