求助两道数学题

leogm

Q27:

A pharmaceutical company received $3 million in royalties on the first $20 million in sales of the generic equivalent of one of its products and then $9 million in royalties on the next $108 million in sales.  By approximately what percent did the ratio of royalties to sales decrease from the first $20 million in sales to the next $108 million in sales? （不明白要求什么？）

 

A.     8%

B.     15%

C.     45%

D.     52%

E.      56%

Answer: C

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Q29:

Is the integer n odd?

(1)     n is divisible by 3.

(2)     2n is divisible by twice as many positive integers as n.（什么意思？）

                  

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

buda

第一题，个人认为应该是（3/20-9/108)/3/20  打个比方就是利润率减少了多少，呵呵

第二题，不明白，请教牛人，呵呵，这句话是不是说2N可以被2N个数整除？不太靠谱

[此贴子已经被作者于2008-6-8 17:41:24编辑过]

huangxiuying

第一题我也没看懂希望有NN解答一下

第二题，（1）不用说了，（2）是说2N能被2N个数整除，那么2N就应该是2吧，N=1

leogm你看对吗

leogm

谢谢两位，第一道题就是求利润率下降了多少，而第二题就如楼上mm说的，n只能等于1

看样子要把数学做好，还要练好阅读才行。

xyz722

 2n is divisible by twice as many positive integers as n.

这句话是说若N能被X个正数整除，则2N能被2X个正数整除吧！