prep07数学错题求解答！

Blannnk · 发表于 2016-10-11 19:34:20

147.
Each employee on a certain task force is either a manager or a director. What percent of the employees on the task force
are directors?
(1) The average (arithmetic mean) salary of the managers on the task force is $5,000 less than the average salary of all
employees on the task force.
(2) The average (arithmetic mean) salary of the directors on the task force is $15,000 greater than the average salary of all
employees on the task force.

55.
Malik's recipe for 4 servings of a certain dish requires 3/2 cups of pasta. According to this recipe, what is the number of
cups of pasta that Malik will use the next time he prepares this dish?
(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.

128.
The points A, B, C, and D are on a number line, not necessarily in that order. If the distance between A and B is 18 and the
distance between C and D is 8, what is the distance between B and D ?
(1) The distance between C and A is the same as the distance between C and B.
(2) A is to the left of D on the number line.

. Last month 15 homes were sold in Town X.The average (arithmetic mean) sale price of the homes was $150,000 and the median sale price was $130,000.Which of the following statements must be true?
I.At least one of the homes was sold for more than $165,000.
II.At least one of the homes was sold for more than $130,000 and less than $150,000.
III.At least one of the homes was sold for less than $130,000.
A.I only
B.II only
C.III only
D.I and II
E.I and III

这几道题错了一直没想明白，求cd上各位大神帮帮忙！十分感谢！！

[原始] prep07数学错题求解答！

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