#### 题目列表

List L consists of the 7 numbers u, -2u, -3u, -4u, -5u, -6u, and -7u, where u≠0.

#### Quantity A

The median of the 7 numbers in list L

u

a > 0

#### Quantity A

$(a+a^{-1})^{2}$

#### Quantity B

$a^{2}$+$a^{-2}$

|2y -5| < 1

y

#### Quantity B

1

If x postage stamps were divided evenly among 4 boys, each boy would receive y postage stamps. If the x postage stamps were divided evenly among 6 boys, each boy would receive z postage stamps. If y - z =25, what is the value of x?
In the xy-plane, a circle is centered at the point (-4,3) and passes through the origin. What is the area of the circle?

The thin rectangular sheet of metal shown in the figure is 8 inches wide and x inches long. An open box is to be made by cutting a 2-inch square from each corner of the sheet of metal and then folding up the sides. If the volume of the box is to be 48 cubic inches, what is the value of x ? From a set of 100 numbers, half were selected to form group I, and 60 percent of the remaining numbers were selected to form group II. The average (arithmetic mean) of the numbers in group I is 24.4, and the average of the numbers in group II is 31.5. Which of the following is closest to the average of the numbers in groups I and II combined?
Of the students in a certain group, 22 percent are juniors and 26 percent are seniors.

#### Quantity A

The ratio of the number of juniors in the group to the number of seniors in the group.

#### Quantity B

$\frac{4}{5}$

n is an integer, and k is not an integer. 0 < k < n < k+2

Quantity A: n

Quantity B: k +1
Which of the following pairs of integers have reciprocals whose sum is either less than $\frac{1}{3}$ or greater than $\frac{1}{2}$ ?

Indicate all such pairs.
A list consists of 10 positive integers. The sum of the 10 integers is 101. If no integer appears more than twice in the list, what is the greatest possible integer that can appear in the list?

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