求教一道数学题GWD 31第2套22题

marinezhenger

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

shawlen

E

anchorets

这题答案是B吧？

but i agree with C

marinezhenger

答案就是C，我没绕腾过来，给我讲讲？谢谢

bobwangwbs

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

oliviading

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？

marinezhenger

sorry,我明白了

Rachmaninoff

C