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标题: 求教一道数学题GWD　31第2套22题 [打印本页]

作者: marinezhenger 时间: 2007-12-21 07:12 标题: 求教一道数学题GWD　31第2套22题

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

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

(2) The company’s profit was greater 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 NOT sufficient.

多谢指点

作者: shawlen 时间: 2007-12-21 09:24

E

作者: anchorets 时间: 2007-12-21 21:05

这题答案是B吧？

but i agree with C

作者: marinezhenger 时间: 2007-12-22 06:27

答案就是C，我没绕腾过来，给我讲讲？谢谢

作者: bobwangwbs 时间: 2007-12-22 19:26

题L+M+P=500,000 T=M+L求P>150,000

(1)T=3M

(2)P>L

3M=M+L L=2M and P>L so P>2M

suppose P=2M

L+M+P=2M+M+2M=500,000

M=100,000

P>200,000

C is correct

作者: oliviading 时间: 2007-12-23 19:00

我也这么想了。可是，如果P很大，比如7M，那么2M+M+7M=500，000，M＝50,000

P=2M,不是才100,000吗？

作者: marinezhenger 时间: 2007-12-24 06:30

sorry,我明白了

作者: Rachmaninoff 时间: 2007-12-31 10:45

C

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