|
OG18-数学分册
|
A tank containing water started to leak. Did the tank contain more than 30 gallons of water when it started to leak?(Note :1 gallon = 128 ounces ) (1) The water leaked from the tank at a constant rate of 6.4 ounces per minute.(2) The tank became empty less than 12 hours after it started to leak.
|
|
OG18-数学分册
|
 The circular base of an above-ground swimming pool lies in a level yard and just touches two straight sides of a fence at points A and B, as shown in the figure above. Point C is on the ground where the two sides of the fence meet. How far from the center of the pool's base is point A ? (1) The base has area 250 square feet.(2) The centre of the base is 20 feet from point C.
|
|
OG18-数学分册
|
Each of the 45 books on a shelf is written either in English or in Spanish, and each of the books is either a hardcover book or a paperback. If a book is to be selected at random from the books on the shelf, is the probability less than $$\frac{1}{2} $$that the books selected will be a paperback written in Spanish?(1) Of the books on the shelf, 30 are paperbacks.(2) Of the books on the shelf, 15 are written in Spanish.
|
|
OG18-数学分册
|
Last year $$\frac{3}{5}$$of the number of a certain club were males. This year the members of the club include all the members from last year plus some new members. Is the fraction of the members of the club who are males greater this year than last year?(1) More than half of the new members are male.(2) The number of members of the club this year is $$\frac{6}{5}$$ the number of members last year.
|
|
OG18-数学分册
|
If a , b, and c are consecutive integers and 0 < a < b < c, is the product abc a multiple of 8?(1) The product ac is even.(2) The product bc is a multiple of 4.
|
|
OG18-数学分册
|
What is the area of rectangular region R?(1) Each diagonal of R has length 5.(2) The perimeter of R is 14.
|
|
OG18-数学分册
|
If r, s, and t are nonzero integers, is $$r^{5}s^{3}t^{4}$$ negative ?(1) rt is negative(2) s is negative
|
|
OG18-数学分册
|
If xy > 0, does (x -1)(y -1) = 1?(1) x + y = xy(2) x =y
|
|
OG18-数学分册
|
If n is positive, is $$\sqrt{n} > 100$$?(1) $$\sqrt{n - 1} > 99$$(2) $$\sqrt{n + 1} >101$$
|
|
OG18-数学分册
|
Is the perimeter of square S greater than the perimeter of equilateral triangle T?(1) The ratio of the length of a side of S to the length of a side of T is 4:5.(2) The sum of the lengths of a side of S and a side of T is 18.
|
|
OG18-数学分册
|
What is the value of $$x^{2} - y^{2}$$?(1) $$({x - y})^{2} = 9$$(2) x + y = 6
|
|
OG18-数学分册
|
Each Type A machine fills 400 cans per minute, each Type B machine fills 600 cans per minute, and each Type C machine installs 2,400 lids per minute. A lid is installed on each can that is filled and on no can that is not filled. For a particular minute, what is the total number of machines working?(1) A total of 4,800 cans are filled that minute.(2) For that minutes, there are 2 Type B machines working for every Type C machine working
|
|
OG18-数学分册
|
The arithmetic mean of a collection of 5 positive integers, not necessarily distinct, is 9. One additional positive integer is included in collection and the arithmetic mean of the 6 integers is computed. Is the arithmetic mean of the 6 intergers at least 10?(1) The additional integer is at least 14.(2) The additional integer is a multiple of 5.
|
|
OG18-数学分册
|
If n is the least of three different integers greater than 1, what is the value of n?(1) The product of the three integers is 90.(2) One of the integers is twice one of the other two integers.
|
|
OG18-数学分册
|
After winning 50 percent of the first 20 games it played, Team A won all of the remaining games it played . What was the total number of games that Team A won?(1) Team A played 25 games altogether.(2) Team A won 60 percent of all the games it played.
|
|
OG18-数学分册
|
 In the figure above, line segment OP has slope $$\frac{1}{2}$$ and line segment PQ has slope 2.What is the slope of line segment OQ?(1) Line segment OP has length $$2\sqrt{5}$$.(2) The coordinates of point Q are (5,4).
|
|
OG18-数学分册
|
If $$x\neq0$$, what is the value of $$(\frac{x^{p}}{x^{q}})^{4}$$？(1) p = q(2) x =3
|
|
OG18-数学分册
|
In Year X,8.7 percent of the men in the labor force were unemployed in June compared with 8.4 percent in May. If the number of men in the labor force was the same for both months, how many men were unemployed in June of that year?(1) In May of Year X, the number of unemployed men in the labor force was 3.36 million.(2) In Year X, 120,000 more men in the labor force were umemployed in June than in May.
|
|
OG18-语文分册
|
The use of growth-promoting antibiotics in hog farming can weaken their effectiveness in treating humans because such use can spread resistance to those antibiotics among microorganisms. But now the Smee Company, one of the largest pork marketers, may stop buying pork raised on feed containing these antibiotics. Smee has 60 percent of the pork market, and farmers who sell to Smee would certainly stop using antibiotics in order to avoid jeopardizing their sales. So if Smee makes this change, it will probably significantly slow the decline in antibiotics' effectiveness for humans. Which of the following, if true, would most strengthen the argument above?
|
|
OG18-语文分册
|
To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey. Clearly, the fish pass is defective.Which of the following, if true, most seriously weakens the argument?
|