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.
A total of 72 passengers are on a ship, and they go out on an excursion in boats R and Q. How many of the ship’s passengers are female ？（）
(1) There are 13 females on boat Q.
(2) There are equal numbers of women on boats R and Q.
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：C
解析：
alone is insufficient because it gives no information about the number of females on boat R. (2) alone is insufficient because it does not give the number of women on either boat. If the statements are combined, we see that there are 13 women on each boat, or 26 in all.