求教GWD1--19

chinamyb

    

Q19:

    

A total of $60,000 was invested for one
year.  But of this amount earned simple
annual interest at the rate of x percent per year, and the rest earned simple
annual interest at the rate of y percent per year.  If the total interest earned by the $60,000
for that year was $4,080, what is the value of x?

    

(1)     x =
(3/4) y

    

(2)   The ratio of the amount
that earned interest at the rate of x percent per year to the amount that
earned interest at the rate of y percent per year was 3 to 2.

    

                  

    

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.

谢谢各位大侠~~！！

ted810

AX+BY=4080;A+B=60000.

如果X不=Y,要求出上述方程的值需要＋2条件。

1、条件是 x = (3/4) y，无解，求不出。

2、条件是A/B=3/2,单独此条件，也无解。

3、如果条件1＋条件2，可求出36000X＋4/3×24000X＝4080，X＝6％，有解。

故应该选C啊。

chinamyb

谢谢！！感激涕零！！