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.
Is 3x greater than 100 ？（）
(1) 9x=36
(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.
参考答案：D
解析：
To be able to answer this question, we need to know a numerical value for x, because any numerical value will give a value for 3x that is either greater or less than 100. (1) gives the value of 4 for x, so it is sufficient (3x=81; it is not greater). (2) can be restated as 100＞3x, so 3x cannot be greater than 100, and (2) is sufficient to answer the question.