#### 题目列表

If 1 kilometer is approximately 0.62 mile, what is the approximate speed, in kilometers per hour, of a car that is traveling at a speed of 50 miles per hour?
What fraction of the people in the age-group 20 to 49 indicated newspaper or the Internet as their preferred method to obtain news?
n=1234567891011121314--498499500 (from 1 to 500)

How many digits does n have?
n is an integer made of some consecutive odd numbers from 1. N=13579111315- What is the units digit of n if it has only 41 digits?
$a^{2}$+$b^{2}$=145. If both a and b are integers, what are the possible values of a+b?

Indicate all such values.
$x^{2}$+$y^{2}$=52. Both x and y are integers and x > y

Quantity A: x

Quantity B: 4
50 guests have to be arranged into 16 tables. Each table can accommodate at most 4 guests. What is the greatest possible number of tables that accommodate only 1 guest?
The sum of three different positive integers is 11. Select two of the following statements that can together identify the three numbers.
A pencil costs $2 each and a pen costs$3 each. If Mike spent $15 on pens and pencils, then how many pens and pencils did he buy in total? Indicate all such values. If a person hits the shaded area, he or she could get 3 points; however, if a person hits the smaller circle, he or she could get p points. If Mark gets 47 points in total, then what`s the possible values of p? Indicate all such values. Someone purchased 391 handbags and those handbags need to be shipped in cases. There are three types of cases with capacity of 5, 12 and 20. The number of handbags each case holds cannot exceed the maximum capacity of it. The price for these cases are$1, $2 and$3, respectively. How much will it be greater in total price if handbags are all packaged in cases with a capacity of 5 handbags than if they are packaged in a way that ensures the minimum possible total price?
The average of 14 different positive integers is 14, what is the greatest possible value of the integers?
There are n positive integers. The sum of the numbers is greater than 50, while the arithmetic average of the numbers is 2.5. What is the least value of n?
If 15% of the class is 16 years or older, then at least how many students are in the class?
In a club, 4/7 of members are female, then which of the following could be the number of male members?

Indicate all such numbers.
If k is an integer and 121 < $k^{2}$ < 225, then k can have at most how many values?
Both x and y are integers, and 1 < -x < 4, 2 < y < 5. What is the least possible value of xy?
$x^{4}$$y^{3}$$z^{2}$ < 0 (x, y and z are all integers)

Quantity A: xyz

Quantity B: 0
3n+1 is an even number

Quantity A: $(-1)^{n+1}$

Quantity B: 1
f(n)= $\frac{n(n+1)}{2}$

m is an integer

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

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

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