在请教一道涛涛数学题

cyberalien · 发表于 2010-4-30 11:49:46

Q22:
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.
Answer:

cyberalien · 发表于 2010-5-2 11:41:33

答案居然是C。
可是我觉得应该是E，希望各位大神赐教。

angel881020 · 发表于 2010-5-2 22:17:33

公司收到的钱总共是500000，然后说只用给材料和人工的成本，问公司的利润是否大于150000.

A中说总成本是三倍的材料成本，设总成本为C，材料成本为M，有C=L+M，有关系C=3M,L=2M
B中说公司的利润大于人工成本有公式500000-C>L，所以就有500000-3M>2M,就可以读书M<100000，C<300000，所以利润是会大于200000，就肯定大于150000的了

在请教一道涛涛数学题

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