#### 题目列表

If 40 units of water is discharged from a tank, then the water volume ratio in the tank will drop from $\frac{1}{5}$ to $\frac{2}{11}$. Next, if the tank needs to be filled with water, how many units of water need to be added to the tank?
When working at their respective rates, machine A produces 50 vases per hour and machine B produces 60 vases per hour.

#### Quantity A

The total number of vases machine A produces

#### Quantity B

The total number of vases machine B produces

A large pump and a small pump are available to fill a public fountain with 7,500 gallons of water. The pumps can be used alone or simultaneously. Working alone at their respective constant rates, the small pump would take 1.6 times as long as the large pump to fill the fountain. Working simultaneously at their respective constant rates, the two pumps would take 3 hours to fill the fountain. How long would the small pump take to fill the fountain, working alone at its constant rate?

_____hours
A certain machine devotes 45 seconds every 3 hours to a system check, and the machine is in operation 24 hours a day. At this rate, how many days of production will it take for the machine to spend a total of 3 hours on systems checks?

Pet drove a car 400 miles in 8 hours. For the first 6 hours, Pat drove on highway X; and the rest of the time, Pet drove on Highway Y. If the average speed for the car on highway X was 20 miles per hour more than the average speed on Highway Y, what was the cars average speed, in miles per hour, on highway Y?
On a trip, Marie drove the first half of the distance at an average speed of 30 miles per hour for a total of 13 hours of driving, and Juanita will drive the second half of the trip. They scheduled t hours driving for the entire distance. If they are to arrive exactly on schedule, at what average speed must Juanita drive the second half of the distance?
d=($\frac{v_i+v_f)/}{2}$)t

For an object that travels in a straight line with constant acceleration, the distance d that the object travels during time t is given by the formula shown, where v_i and v_f are the initial velocity and the final velocity of the object, respectively. A vehicle travelled distance of 32 kilometers along a straight route with constant acceleration. According to the formula, approximately how many minutes did it take the vehicle to travel the distance if the initial velocity and the final velocity of the vehicle were 14 meters per second and 20 meters per second, respectively?
A certain train travels 150 miles in h hours at the average rate of m miles per hour.

#### Quantity A

The number of hours required for the train to travel 320 miles at the average rate of 2m miles per hour

#### Quantity B

h

Last Saturday a cyclist started a 40-kilometer trip at 9 oclock in the morning and rode at an average speed of 20 kilometers per hour for 45 minutes. The cyclist stopped to rest for x minutes and then rode at an average speed of 30 kilometers per hour until the trip was completed at 11 oclock in the morning. What is the value of x?
r > s

List L consists of r values, and the average (arithmetic mean) of the values in L is 52.8. List M consists of s values, and the average of the values in M is 54.2. List K consists of the values in L and the values in M.

#### Quantity A

The average of the values in K

#### Quantity B

53.5

Company A and B earn commission fees based on their sales.

If company A sells $3,000, then how much does company B have to sell such that company B earns the same commission fee as company A? Tickets for a carnival are sold either individually or in packages of 10 tickets or 20 tickets at the costs shown in the table. A group of friends bought n tickets for the least possible total cost. A second group of friends bought more than n tickets for a total cost that was less than the first groups total cost. Which of the following could be the value of n? Indicate all such values. A certain money market account that had a balance of$48,000 during all of last month earned $360 in interest for the month. At what simple annual interest rate did the account earn interest last month? If$10,000 is split into two parts and put away in the bank with an annual single interest rate of 2% and 5%, respectively. A year later, the total interest amounts to from $475. How much money is put away in the latter bank? Give your answer to the nearest 0.1. A total of$48,000 was invested for one month in a new money market account that paid simple annual interest at the rate of r percent. If the investment earned \$240 in interest for the month, what is the value of r?
Paul`s family put m dollars in a new savings account on May 2, 1990, and put the same number of dollars in the account on May 2, 1991, and again on May 2, 1992. If the annual interest rate on this account was 4 percent compounded annually and there were no other deposits to the account or withdrawals from the account, which of the following represents the total number of dollars in the account on May 2, 1993, just after interest had been compounded for the third time, in terms of m?
There are 10 people in a room. If each person shakes hands with exactly 3 other people, what is the total number of handshakes?
The sum of n numbers is greater than 48. If the average (arithmetic mean) of the n numbers is 1.2, what is the least possible value of n?
3x+y=5x-y

x

#### Quantity B

y

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