The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.
If x and y are both positive numbers, is x greater than 75% of y ？（）
(1) 5x＞4y+1
(2) x=6
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.
参考答案：A
解析：
states that x is greater than 80 percent of y (the easiest way to confirm this is to plug in numbers), so the question is answered in the affirmative and (1) alone is sufficient. (2) is insufficient without providing any information about the relative value of y, so the answer is A.