Q26:只有0.5满足条件1和2，所以应该选d ,答案错了吗？

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.

Q34:n只能为3，应该选d, 怎么答案是b 呢？

What is the value of the integer n?

(1)
      n(n + 2) = 15

(2)
      (n + 2)ⁿ = 125

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.

Q26, 16x is integer, x can be 0.125,or 0.0675 or ... 8x is integer, x has to be larger than 0.1

Q34, 15 = 3*5 = (-5)*(-3)