GWD Question!

mumfish1224

Q19:  （求解）

In the xy-plane, the sides of a certain rectangle are parallel to the axes.  If one of the vertices of the rectangle is (-1,-2), what is the perimeter of the rectangle?

(1)      One of the vertices of the rectangle is (2, -2).

(2)      One of the vertices of the rectangle is (2, 3).

                  

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: B

 

 

      

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Q20: （整体思路？因为我是用推的）

Tom, Jane, and Sue each purchased a new house.  The average (arithmetic mean) price of the three houses was $120,000.  What was the median price of the three houses?

(1)     The price of Tom’s house was $110,000.

(2)     The price of Jane’s house was $120,000.

                  

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: B

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Q21: （2）为什么意思？

A certain circle in the xy-plane has its center at the origin.  If P is a point on the circle, what is the sum of the squares of the coordinates of P?

(1)      The radius of the circle is 4.

(2)      The sum of the coordinates of P is 0.

                  

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: A

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Q23: （求思路）

One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee.  The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y.  Is x < 0.8?

(1)     y > 0.15

(2)     C ≥ 7.30

                  

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: B

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