GWD 17-20

ybava018919

For any integers x and y, min(x, y) and max(x, y) denote the minimum and the maximum of x and y, respectively.For example, min(5, 2) = 2 and max(5, 2) = 5.For the integer w, what is the value of min(10, w) ?
(1)w = max(20, z) for some integer z.
(2)w = max(10, w)

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.

答案选D.

第一项是怎么退出来的，一个是w，一个是z。谢谢。

ybava018919

多谢！

liuyinghong

首先 value of min(10,w) 需要知道10和w谁大谁小
如果10〉w 那么value of min(10,w)就等于w，反之，如果10《w 那么value of min(10,w)就等于w
问题就是w是大于10还是小于10

1）W=MAX(20,Z)
    If Z<20, w=max(20,z)=20; w=20>10
    if z>20, w=max(20,z)=z>10, w=z>10
whatever the value of z, w is always > 10 so it is sufficient

2) w=max(10,w) indicates that w>10
so it is sufficient,too

vansonkated

w=z>20