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181215	Two classes play 10 games, and the scores of the two classes are shown in the table below. Is the average score of class A higher than that of class B? 1: The minimum scores of each classes are 0. 2: f=4.
Ready4	Ice-cream sodas are much more popular among American children than children of other countries.
OG19 OG20 OG2022	From 2000 to 2003, the number of employees at a certain company increased by a factor of 1/4. From 2003 to 2006, the number of employees at this company decreased by a factor of 1/3. If there were 100 employees at the company in 2006, how many employees were there at the company in 2000?
OG19-数学分册	David used part of $100,000 to purchase a house. Of the remaining portion, he invested $$\frac{1}{3}$$ of it at 4 percent simple annual interest and $$\frac{2}{3}$$ of it at 6 percent simple annual interest. If after a year the income from the two investments totaled $320, what was the purchase price of the house?
OG19-数学分册	A certain toll station on a highway has 7 tollbooths, and each tollbooth collects $0. 75 from each vehicle that passes it. From 6 o'clock yesterday morning to 12 o'clock midnight, vehicles passed each of the tollbooths at the average rate of 4 vehicles per minute. Approximately how much money did the toll station collect during that time period?
Ready4	If Vince works 4 hours at a museum and earns $x$ dollars per hour, and he works 6 hours at an office and earns $y$ dollars per hour, what is the average amount, in dollars, that Vince earns per hour?
Ready4	If by agreement a service department must reply to any customer inquiry within 84 hours, does the last moment by which it must respond to a particular inquiry occur on a Friday? The inquiry was placed on a Tuesday. The inquiry was made between 2:00 p.m. and 4:00 pm.
	A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow. If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?
应用题	Of the books standing in a row on a shelf, an atlas is the 30th book from the left and the 33rd book from the right. If 2 books to the left of the atlas and 4 books to the right of the atlas are removed from the shelf, how many books will be left on the shelf?
OG15 OG16 OG17 OG18 OG19 OG20 OG2022	Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. If the length of the longest piece of rope is 14 centimeters more than 4 times the length of the shortest piece of rope, what is the maximum possible length, in centimeters, of the longest piece of rope?
	If 60 people attend a party, how many of these people drink coffee?(1) The number of people at the party who drink coffee is 4 times the number of those who do not drink coffee.(2) The number of people who don't drink coffee is 36 less than the number who do drink coffee.
PREP07 Test 1	Two water pumps, working simultaneously at their respective constant rates, took exactly 4 hours to fill a certain swimming pool. If the constant rate of one pump was 1.5 times the constant rate of the other, how many hours would it have taken the faster pump to fill the pool if it had worked alone at its constant rate?
181215	There are 7 rods in total. 2 rods are 5 in length. 3 rods are 4 in length and 2 rods are 2 in length. The seven rods are put into three bobbins. What is the minimum possible sum of the length of the rods in the bobbin where the length of the rods is maximum?
OG12 OG15 OG16	Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and $$\overline{PR}$$ is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities $$-4 \le x \le 5$$ and $$6 \le y \le 16$$. How many different triangles with these properties could be constructed?
应用题	A certain one-day seminar consisted of a morning session and an afternoon session. If each of the 128 people attending the seminar attended at least one of the two sessions, how many of the people attended the morning session only?(1) $$\frac{3}{4}$$ of the people attended both sessions.(2) $$\frac{7}{8}$$ of the people attended the afternoon session.
PREP07 Test 1	When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year,the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?
Ready4	Is the positive integer $x$ a multiple of 48? (1) $x$ is a multiple of 4. (2) $x$ is a multiple of 12.
Ready4	The organizers of a conference offered a certain number of simultaneous seminars with the intention that each seminar would be attended by 18 conference attendees. However, space limitations allowed only up to 15 conference attendees to participate in each of a number of the seminars, leaving 4 remaining seminars that together would be attended by at least 93 conference attendees. How many seminars were there?
Ready4	Sigmund Freud, considered by some the father of modern psychology, developed his theory of psychoanalysis by establishing a conception of the human subconscious and he applied that idea to the interpretation of dreams.
Ready4	Each item sold at a market is labeled with a 2-, 3-, or 4-digit code where each digit is selected from the digits 1 through 9, inclusive. If the digits may be repeated and if the same digits used in a different order represent a different code, how many different items at the market can be labeled with a unique code?