Q5: If k, m, and t are positive integers and k/6+ m/4= t/12, do t and 12 have a common factor greater than 1 ?
(1) k is a multiple of 3.
(2) m is a multiple of 3.
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 :a

Q10:   If x² + 3x + c = (x + a)(x + b) for all x, what is the value of c ?

(1) a = 1 (2) b = 2
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: d

Q17: How many prime numbers between 1 and 100 are factors of 7,150 ?
A. One
B. Two
C. Three
D. Four
E. Five answer:d Q36: If a and b are positive integers such that a – b and are both even integers, which of the following must be an odd integer? A. a/2 B. b/2 C. (a+b)/2 D. (a+2)/2 E. (b+2)/2
answer:d 我觉得答案也许错了，不过也许是我错了，谢谢大家帮忙

Q10:

原方程两边打开，化简得到x^2+3x+c=x^2+(a+b)x+ab

由于对于所有x都成立，所以方程两边对应可以得到a+b=3， ab=c

这样，如果知道a=1，那么可以得到b=2，c就等于ab=2

同理，（2）也符合要求。  选D

Q17: