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一道涛涛数学题,题没看懂 求高手指点!!!

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发表于 2012-9-4 13:05:21 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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.

But of this……,the rest……  哪来的rest,指的都是是60000吧
纠结~~求解释
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沙发
发表于 2012-9-4 13:11:36 | 只看该作者
就是说你的预算总额是60000,分了两笔投资,一笔的年息是x%,另外一笔的年息是y%,一年下来这两部分一共赚了4080刀,问你下面两个选项谁能求出X的值是多少?
那就假设A+B=60000,然后A*X%+B*Y%=4080,求X.
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