Which of the positive numbers x or y is greater?
(1) y = 2x
(2) 2x + 5y = 12
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析:
(1) 由于x和y均为正数,由条件1,y为x的两倍,所以y必然比x大,题目得解。
(2) 由条件2,x=1,y=2,满足条件2,此时x<y。但x=4,y=0.8,也满足条件2,此时x>y。
因此,本题答案为(A),仅条件1可以解题,条件2不行。
坑:positive numbers, not integers
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