#### 题目列表

$\frac{(8x^21+12x^20-108x^19+\sqrt(36x^4))}/{(2x)}=3x$Which of the following values of x satisfy the above equation?
Brian spent $\frac{1}{4}$ of his paycheck to repair his car, and then paid the registration and insurance, which each cost $\frac{1}{4}$ of the remainder of his paycheck. If Brian had $0 before he was paid, and he now has$231 left, what was the amount of his paycheck?
If a is 60% of b, b is 40% of c, and c is 20% of d, then 6d is what percent of 20a?_____%
If 1 ≤ n ≤ 100, and $\frac{(n+7)}{2}$ is a multiple of 4 but not a multiple of 3, then which of the following could be true?Indicate all possible values.
In terms of y, what is the average (arithmetic mean) of 4y and 22 ?

#### Quantity A

The average (arith?metic mean) of 14, 22, and 48

#### Quantity B

The average (arith?metic mean) of 12, 22, and 50

2, 3, 5, 7

#### Quantity A

The average (arithmetic mean) of the numbers above

#### Quantity B

The median of the numbers above

Susan travels by car at an average speed of 50 miles per hour for 4 hours and then at an average speed of 20 miles per hour for 2 hours. What is her average speed, in miles per hour, for the entire 6-hour trip?
Liz owns 2 green t-shirts, 4 blue t-shirts, and 5 red t-shirts.

#### Quantity A

The probability that Liz randomly selects a blue t-shirt

#### Quantity B

$\frac{2}{5}$

#### Quantity A

The average (arithmetic mean) of 4 numbers, each less than 6 and greater than 5

#### Quantity B

The median of 6 numbers, each less than 5 and greater than 4

For which of the following values of x is the mode of 2x, x + 5, 3x-2, 5x-7, and 4x equal to 4 ?
A hat contains 18 raffle tickets, numbered 1 through 18. If two raffle tickets are chosen at random from the hat, what is the probability that both tickets are even numbers?
k > j > 0

#### Quantity A

The time it takes to read k words at j words per minute

#### Quantity B

The time it takes to read (k + 10) words at (j + 10) words per minute

How many committees of 5 members can be chosen from a group of 8 people?
The average (arithmetic mean) number of passengers on a subway car is 60. If the number of passengers on a car has a normal distribution with a standard deviation of 20, approximately what percent of subway cars carry more than 80 passengers?
If the average of 10, 12, n, and n is greater than 25, what is the least possible value of integer n ?
$x,x^2,x^y,x^(y-1),x^4,x^6$x > 1

#### Quantity A

The mode of the numbers above when y = 4

#### Quantity B

The median of the numbers above when y = 5

Trip A is 6x miles long and takes 5y hours. Trip B is 5x miles long and takes 4y hours.

#### Quantity A

The rate of trip A in miles per hour

#### Quantity B

The rate of trip B in miles per hour

If the probability that the first event will occur is $\frac{1}{4}$, and the probability that the second event will occur is $\frac{1}{\sqrt(x+2)}$, then what is the probability that both events will occur?
Five numbers in a set are arranged from least to greatest. If the median of the first two numbers is 13 and the average (arithmetic mean) of the remaining numbers is 23, what is the average (arithmetic mean) of the entire set?_____

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