问题 单项选择题

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
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.

What is the average of a list of n consecutive integers
(1) The smallest number in the list is 5.
(2) n=8

答案

参考答案:C

解析:Statement (1) tells us the smallest number, but not how many numbers are in the list. It is not sufficient. Cross off A and D.
Statement (2) tells us the value of n, so the question becomes: What is the average of a list of 8 consecutive integers Since those integers can be large, small, or even negative, we have no way to tell what the average is. Statement (2) is not sufficient, so we can eliminate B.
Now let’s put the two statements together. If we know that 5 is the smallest number in a list of 8 consecutive numbers, then we can easily reconstruct the list and find the average. So the statements are sufficient when put together, and the answer is C.

问答题

某市拟建一工业项目,年生产能力为500万吨某产品。同类型年产400万吨的已建项目设备投资额为800万元,且该已建项目中建筑、安装及其他工程费用占设备费的百分比分别为40%、15%、10%,相应的综合调价系数分别为1.08、1.1、1.01。

公司董事会决定:资本金投资占60%,负债(贷款)投资占40%,建设期为3年。建设期投资安排为:第一年投资额为30%,第二年投资额为40%,第三年投资额为30%;其中第一年贷款资金占贷款总额的30%,第二年占40%,第三年占30%。

该项目在实施过程中,为了确定其预算造价,某分部分项工程在现行定额中无此项目,也不符合定额换算条件。

经测算与分析:

①人工消耗:基本用工14.5工日/10m2,其他用工占总用工的12%;

②材料消耗:650kg/10m2,损耗率为1.8%;

③机械消耗:5台班/10m2

④预算价格:人工工日单价22元/工日,主材费用18.5元/kg,其他材料费9.5元/10m2,机械台班单价250元/台班。

1.一个建设项目的投资估算造价是由哪些投资构成的?

2.已知生产能力指数n=0.7,综合调价系数f=1.15,则该项目的设备投资额为多少万元?

3.拟建项目的总投资额为多少万元?

4.建设期的贷款利息为多少万元已知贷款利率为10%。

5.涨价预算费为多少万元已知建设期内年平均价格上涨3.3%。

6.实施过程中某分项工程的补充定额单价为多少元?

多项选择题