GWD数学两题

ken178

Q26:
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)16x is an integer.
(2)8x is an integer.

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:

catharine6699

第二题是不是C啊

ken178

恩，第二题是C。有第一题详细的解答吗？
最好第二题也说说，谢谢

ken178

ken178

86.    7767-!-item-!-187;#058&005660
Each of the students in a certain class received a single grade of P, F, or I.  What percent of the students in the class were females?
C
(1)  Of those who received a P, 40 percent were females.

(2)  Of those who received either an F or I, 80 percent were males.

这题prep也不明白

ken178

Q26:
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)16x is an integer.
(2)8x is an integer.

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:


各位帮忙看看这一道GWD问的是什么，读不懂啊。晕了。利用自己的旧帖子问问题，哈哈

maximeason

这题答案多少 明确点

maximeason

我认为答案是B
设16x为1 这是最小的情况了 得出 x为0.0625 设16x为2 则 x为0.125  这时候就发现 没法得知他的十分位一定为零
设8x为1 得出 x为0.125 为2时 x为0.25  为3时 x为0.375 直到x接近1而不等于1的时候 发现十分位永远是nonzero.

ken178

哦，原来这题是问x的十分位是不是为0.我就看不明白题目问的是什么