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If the average (arithmetic mean) of b and c is 5, and the average of c and d is 10, then b - d =
If the average (arithmetic mean) of x, y, and 20 is 11, then the average of 2*x + 3, 2*y - 4, and 8 is

Quantity A

The average (arithmetic mean) of$$3^{2},3^{4},3^{6}$$

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


The average (arithmetic mean) weight of 8 children is 100 pounds.

No child weighs exactly 100 pounds.

Quantity A

Number of children who weigh more than 100 pounds.

Quantity B

Number of children who weigh less than 100 pounds.


The sum of 5 consecutive even integers is 0.

Quantity A

The product of the 5 integers

Quantity B

0


Triangle A has sides with length 5, 5 and 8.

Triangle B has sides with length 8, 8 and 5.

Quantity A

The average (arithmetic mean) measure of the 3 angles of triangle

Quantity B

The average (arithmetic mean) measure of the 3 angles of triangle B.


Set A:{0.2, 0.4, 0.6, 0.8}

Set B:{2, 4, 6, 8}

Quantity A

Standard deviation of set A

Quantity B

Standard deviation of set B


The average (arithmetic mean) of x , y and 15 is 9.

Quantity A

Average of x and y

Quantity B

16


W, X, Y and Z each represent a different number. If the sum of each column is shown beneath that column, and the sum of each row is shown beside that row, then n = GRE、gre题库、gre模考、gre考满分
The system of equations has how many solutions?

3x - 6y = 9

2y - x - 3 = 0
The average (arithmetic mean) of y numbers is x. If 30 is added to the set of numbers, then the average will be x - 5. What is the value of y in terms of x ?
If |x + 5| = 3 and $$\frac{|2y-1|}{3}=5$$, then |x + y| could equal each of the following EXCEPT
If f(x) =$$12-\frac{x^2}{2}$$ and f(2k) = 2k, what is one possible value for k?
If A, B, C and D are positive integers such that 4A = 9B, 17C = 11D, and 5C = 12A, then the arrangement of the four numbers from greatest to least is
If 3x < 2y < 0, which of the following must be the greatest?
If$$x^{2}+y^{2}=12$$, then $$\frac{x}{y}+\frac{y}{x}=$$

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