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题目内容
$$2^{n}+2^{n}+2^{n}+2^{n}=4^{n+3}$$

Quantity A

n

Quantity B

4


Quantity A

$$\frac{0.91^{8}}{0.91^{9}}$$

Quantity B

1


$$[1.37·(10^{24})]$$·$$[2.6·(10^{-22})]$$=_____
If {$$\frac{2^{-n}}{3}$$}·{$$\frac{3^{-n}}{2}$$}=$$\frac{1}{36}$$, what is the value of n?_____
a, b and c are positive integers. If b equals the square root of a, and if c equals the sum of a and b, which of the following could be the value of c?

Indicate all such values.
If the average (arithmetic mean) of x, y and 15 is 9, and the average of x, 2*y and 2 is 7, then y =
In a certain class, x students are 10 years old, and the remaining y students are 11 years old. What is the average (arithmetic mean) age of all students in the class?
The average (arithmetic mean) of two numbers is 4x. If one of the numbers is y, then the value of the other number is
Which of the following sets of numbers has the greatest standard deviation?
If the average (arithmetic mean) of 24 consecutive odd integers is 48, what is the median of the 24 numbers?
Ten students wrote a test, and the distribution of scores is shown on the frequency table. If the average (arithmetic mean) score is 62, what is the value of x ? GRE、gre题库、gre模考、gre考满分
The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5*a + 20. The fifth number is
If the average (arithmetic mean) of 3, 8, w, x, and y is 14, then the average of w + 2, x - 3, and y + 8 is
What is the average (arithmetic mean) of $$[(\sqrt{8}+\sqrt{2}]^{2}and [(\sqrt{8}-\sqrt{2}]^{2}$$??
If the mean of list A is 6.8 and the standard deviation is 3.6, then how many elements of list A are within 1 unit of standard deviation of the mean?v

A = {2, 9, 2, 6, 9, 10, 7, 4, 5, 14}

Quantity A

$$3^{2}+3^{4}+3^{6}$$

Quantity B

$$3^{4}$$


In a group of 60 people, the average (arithmetic mean) age of the 40 females is 60, and the average age of the 20 males is 70.

Quantity A

Average age of all 60 people

Quantity B

65


w , x , and y are positive integers.

w + x + y = 90

Quantity A

Average (arithmetic mean) of w , x , and y

Quantity B

Median of w , x , and y


w + x + y = 21

Quantity A

Average of x and y

Quantity B

7


The average (arithmetic mean) of 3, 3, 5, 6 and x is 2.

Quantity A

x

Quantity B

-8


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