GMAT数学题库练习题及答案【3】

　　A construction company was paid a total of $500,000 for aconstruction project. The company’s onlycosts for the project were for labor and materials. Was the company’s profit for the projectgreater than $150,000?

　　(1) The company’s total costwas three times its cost for materials.

　　(2) The company’s profit wasgreater than its cost for labor.

　　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 NOTsufficient.

　　参考答案：A

　　题目翻译：公司一共投入50w，只花劳动力和材料，利润大于15w么?

　　题目全解：

　　(1) 总花费材料花费3倍。材料花m，总花费3m，IN;

　　(2) 利润比劳动花费多。IN。(1)+(2)劳动花费3m-m=2m。利润=50-3m>2m，可得m<10，所以3m<30,所以50-3m>20。S。

　　If xy!=0, is x/y = 1?

　　(1) x^2 = y^2

　　(2) xy > 0

　　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 NOTsufficient.

　　参考答案：C

　　题目翻译：xy商不等于0，问x/y等于1么?

　　题目全解：

　　(1) x方等于y方，异号不成立. INSUFFICIENT

　　(2) xy同号，不成立。(1)+(2)，一起成立。