详情

　　今天小编为大家带来GMAT考试真题分享，希望对大家GMAT备考有所帮助。祝各位同学取得令人满意的成绩。和小编一起来看看吧！
　　Data Sufficiency
　　What is the average (arithmetic mean) of a, b, and c
　　(1)a 2b 3c = 10 (2)3a 2b c = 14
　　Answer Choices
　　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.
　　Answer: C
　　Explanation: The average of a, b, and c is a b c/3. Statement (1) says that a 2b 3c = 10, but there is not enough information to determine the value of a b c. Thus, statement (1) alone is not sufficient. Similarly, the equation statement (2) also fails to give enough information, so statement (2) alone is not sufficient. If the equations in statements (1) and (2) are added together, term by term, the result is 4a 4b 4c=24, which means that a b c = 6. The average is therefore 6/3 = 2. Thus, BOTH statements TOGETHER are sufficient to answer the question. The best answer is C.