#### 题目列表

If x is an odd negative integer and y is an even integer, which of the following statements must be true?

I. (3x - 2y) is odd

II. $xy^{2}$ is an even negative integer

III. $(y^{2}-x)$ is an odd negative integer
How many integers from 1 to 900 inclusive have exactly 3 positive divisors?
How many positive integers less than 100 have a remainder of 2 when divided by 13?
Yesterday, a certain school had an equal number of boys and girls. Today, 18 boys left the school, and the ratio of the number of boys to girls is now 3 to 4.

#### Quantity A

Number of boys in the school now.

72

#### Quantity A

0.05 percent of 4000

#### Quantity B

$\frac{1}{200} of 4000$

Ashley's score was 20% higher than Bert's score. Bert's score was 20% lower than Charles' score.

Ashley's score

Charles' score

#### Quantity A

$(\frac{4}{5})%$

#### Quantity B

0.8

Yesterday, Carl had 40 percent more CDs than Karen had. Today, Carl gave 20 percent of his CDs to Karen.

#### Quantity A

Number of CDs that Carl now has

#### Quantity B

Number of CDs that Karen now has

The sales tax at a certain store is 15 percent. The total price of an item, including sales tax, is $45. #### Quantity A Price of item excluding sales tax #### Quantity B$39

Anne pays 150 percent more for a wholesale widget than Bart pays.

Annes retail price per widget is 15 percent greater than the wholesale price she paid.

Barts retail price per widget is 185 percent greater than the wholesale price he paid.

#### Quantity A

Anne's retail price.

#### Quantity B

Bart's retail price.

22 percent of x

#### Quantity B

\frac{2}{9} of x

In 2003, the number of girls attending Jefferson High School was equal to the number of boys. In 2004, the population of girls and the population of boys both increased by 20 percent. Which of the following could be the total student population at Jefferson High School in 2004?
A computer can perform c calculations in s seconds. How many minutes will it take the computer to perform k calculations?
If A is the initial amount put into an account, P is the annual percentage rate of interest, which remains fixed, and the account compounds quarterly, which of the following is an expression, in terms of A and P, for the amount in the account after 5 years?
At the moment there are 54,210 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?
Captown is the capital city of Maltania. If the population of Captown is 25 percent of the rest of the population of Maltania, then the population of Captown is what percent of the entire population of Maltania?
Diana invested $61,293 in an account with a fixed annual percent of interest, compounding quarterly. At the end of five full years, she had$76,662.25 in principal plus interest. Approximately what was the annual percent rate of interest for this account?
If y is 80 percent greater than x, then x is what percent less than y?
Cindy invests \$10000 in an account that pays an annual rate of 3.96%, compounding semi-annually. Approximately how much does she have in her account after two years?
The ratio of two positive numbers is 3 to 4. If k is added to each number the new ratio will be 4 to 5, and the sum of the numbers will be 117. What is the value of k?
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