x and y are integers and $$x^{2} y^{2} =27$$
Quantity A: x
Quantity B: 10

The number 1112131415......484950 is formed by twodigit integers from 11 to 50
Quantity A: the 26th digit (from left to right) of the number
Quantity B: the 45th digit (from left to right) of the number

The sum of n consecutive integers is 30
Quantity A: n
Quantity B: 4

Line l is parallel with line m, EF = CD, FG = AB
Quantity A: the area of trapezoid ABCD
Quantity B: the area of △EGH

Set A={0.2, 0.4, 0.6, 0.8}
Set B={1,2,3,4}
Quantity A: The standard deviation of numbers in Set A
Quantity B: The standard deviation of numbers in Set B

The price of a product was $a in 2001, the price increased 10% in 2002, and decreased 5% in 2003.
Quantity A: the percent increases(or decreases) from 2001 to 2003
Quantity B: 5%

Quantity A:x
Quantity B:y

Two parallel lines are intersected by a third line.
Quantity A: The number of points that have the same distance with all the three lines
Quantity B: 3

Which of the following value is closest to $$\sqrt{79}$$ ?

10.If x=$$10^{6}$$1, which of the following is not the factor of x?

11.What is the probability when a number formed by at least one 6 on all digits is selected from 1 to 1,000 (inclusive)?

A teacher has three courses in total. The average number of students who sign up for each course is 32. Among these students, 5 students sign up for 2 courses, 3 students sign up for all the three courses. How many different students sign up for the three courses in total?





A, B, C, D, and E need to take seats such that A and B sit next to each other. How many ways can they arrange the seats?

Which of the following could be the value of x to make sure that $$x^{3}$$  x is divisible by 10?
Indicate all such values.
