GWD 7-3,15

abiding

HELP! Thanks!!!

Q3:

Material A costs $3 per kilogram, and material B costs $5 per kilogram.  If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?

(1)       y > 4

(2)       The cost of the 10 kilograms of material K is less than $40.

                  

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.

Q15:

Which of the following fractions has a decimal equivalent that is a terminating decimal?

A. 11/189

B. 15/196

C. 16/225

D. 25/144

E. 39/128

Laoben

Q3, answer is B.  (1) Y>4 is not sufficient, if Y = 4.5, X>Y, if Y=5.5, X<Y.

                  (2) is sufficient. only X>Y, the cost can be less than 40.

Q15. answer is E. fractionize all the numbers to the products of their prime number, will get the answer.

lyen_wang

对于15题还是不明白, 有谁可以再解释一下么