GWD

xp635

 

28:

Theater M has 25 rows with 27 seats in each row.  How many of the seats were occupied during a certain show?

(1)   During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows.

(2)   During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

                  

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.

 

觉得选E,求高人鉴定，谢谢

xp635

我设的是前10排平均的unocupation为x，中间10排位y，最后5排位Z。这个只能列方程为：
10x+10y=10*20
10y+5z=20*15
还差一个式子阿，所以求不出中间的10排的空位，所以求不出总的空位

 

哪位帮忙补充鉴定下，谢谢

xp635

 

Leo can buy a certain computer for p1 dollars in State A, where the sales tax is t1 percent, or he can buy the same computer for p2 dollars in State B, where the sales tax is t2 percent.  Is the total cost of the computer greater in State A than in State B?

(1)   t1 > t2

(2) p1t1 > p2t2

                  

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.