[求助]GWD-5-4

小猩猩

Q4:

For a recent play performance, the ticket prices were $25 per adult and $15 per child.  A total of 500 tickets were sold for the performance.  How many of the tickets sold were for adults?

(1)    Revenue  from ticket sales for this performance totaled $10,500.

(2)     The average (arithmetic mean) price per ticket sold was $21.

                  

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.

真的是我太白痴了么？？搜遍CD也没有人问这道题。。。

答案为D，我选B

题目没有给任何有关Revenue 的信息，（1）怎么利用？￥10，500/500tickets？？

谢谢！！！！

sirena_wen

你再仔细看看题，两个条件都能求得唯一解。

第一个是：25x+15(500-x)=10500

aces

以下是引用小猩猩在2008-1-7 19:43:00的发言：

Q4:

For a recent play performance, the ticket prices were $25 per adult and $15 per child.  A total of 500 tickets were sold for the performance.  How many of the tickets sold were for adults?

(1)    Revenue  from ticket sales for this performance totaled $10,500.

(2)     The average (arithmetic mean) price per ticket sold was $21.

                  

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.

真的是我太白痴了么？？搜遍CD也没有人问这道题。。。

答案为D，我选B

题目没有给任何有关Revenue 的信息，（1）怎么利用？￥10，500/500tickets？？

谢谢！！！！

take it easy

条件(一)行的,

x+y=500

25x+15y=10500

估计LZ最近数学看太多了,套进去了

小猩猩

哦...我明白了...Revenue在这里是收入,不是税收啊....在这想怎么没有税率....谢谢了...

非常感谢