GWD数学

Jia0221

1 If n and k are positive integers, is n/k an even integer?

(1)  n is divisible by 8.

(2)  k is divisible by 4.



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.

我决定应该是c啊。。这样不就都是2的倍数么？
Q16:

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r?

(1)  2 is not a factor of n.

(2)  3 is not a factor of n.



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.



Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m.  By what percent did the ratio of price per share to earnings per share increase, in terms of k and m?



A. k/m %

B. (k-m) %

C. [100(k-m)]/(100+k) %

D. [100(k-m)]/(100+m) %

E. [100(k-m)]/(100+k+m) %

zhangjoy123

第一个应该是E吧，，，设第一个8A，第二个是4B，相除是2A/B。但是A为2.B为3时，不可整除，，，即，一个是16，一个12，，不可以整除。。

Jia0221

恩是的~谢啦

zhangjoy123

第二题，，第一个条件是说n是奇数，，因此为1,3,5,7,9，带入后分别余0,8,0,0,0，不成立        除了3的余数为8其余都0.只要排除3
第二条件分别为，0,3,5，，，，，，后面有0有别的，，
两个条件想和，，，就会替第一个条件排除3的可能，，所以c

Jia0221

懂啦懂啦，感谢！