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If x and y are positive integers and x < y, how many different ordered pairs (x, y) are there such that the sum of x and y is 87 and x and y have the same tens digit?
The median of some consecutive odd integers is 0.

Quantity A

The sum of the integers

Quantity B

The sum of the greatest integer and the least integer


n, s and t are all positive integers

If n is a multiple of 7 and n=$$s^{2}$$t,which of the following must be a multiple of 49?
The units digit of $$23^{n}$$ is 7, and if 9 ≤ n ≤ 14, what could be the value of n?

Indicate all such values.
A line in the xy-plane has the equation y=mx+6, where m is a constant and 3 ≤ m ≤ 4. Which of the following could be the x-intercept of the line?

Indicate all such values.

The figure above represents the surface of a wall with an irregular shape, where all measurements are in meters and point P is 10 meters from the bottom edge and 10 meters from the left edge. The surface is to be painted, and one bucket of paint will cover 170 square meters of the surface. If the bucket of paint will cover the part of the surface from the left edge to a vertical line that is x meters from the left edge, which of the following is true?

C is the center of the above circle. The length of DE equals to half of the radius of circle, and ∠ACD=90°.

Quantity A

The area of sector ABD with C at the center

Quantity B

The area of ACE


The probability of event A is 0.5, the probability of event B is 0.3, what is the greatest probability that neither of the two events occur?
For all positive integer n, the function f is defined by the equation f(n)= $$\frac{n(n+1)}{2}$$

m is a positive integer

Quantity A

$$(-1)^{f(4m+1)}$$

Quantity B

$$(-1)^{f(4m+2)}$$


The number 24 has the property that it is divisible by its units digit, 4. How many of the integers between 10 and 70 are divisible by their respective units digits?


The tick marks shown on the number line are evenly spaced. Points D and E have coordinates of $$4^{10}$$ and $$4^{11}$$, respectively. The point that has a coordinate of $$4^{9}$$ is?
In the xy -plane, the circle with radius 50 and center (0, 0) passes through which of the following points?

Indicate all such points.
Joe remembers the first 8 digits of a 10-digit telephone number. If he uses the digits he remembers,what is the maximum number of telephone numbers that he may have to enter in order to reach the correct telephone number?
If $$-1 < y < 0$$, what is the relationship between $$y$$, $$y^{2}$$, $$y^{3}$$, and $$y^{4}$$?
$$P=23^{25}$$-23

What is the units digit of P?
a = $$3^{11}$$+$$3^{16}$$+$$3^{19}$$+$$3^{23}$$)?

What is the units digit of a?

Quantity A

The number of unique prime factors of 27

Quantity B

The number of unique prime factors of 12


n is a positive integer, $$0.5^{n}$$ < 0.0002. What is the least possible value of n?
Student A, B, and C together need 6 hours to finish a task, while A and B together need 8 hours to finish the same task. How many hours will it take for Student C to finish the task alone?
x > 0

y > 0

Quantity A

($$\sqrt{x}$$)($$\sqrt{y}$$)

Quantity B

$$\sqrt{x+y}$$


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