OG19新题 题目总数：142 做题总人数：9125 平均准确率：76%
In 1913, the largely self- taught Indian mathematician Srinivasa Ramanujan mailed 120 of his theorems to three different British mathematicians;only one, G. H. Hardy, recognized the brilliance of these theorems, but thanks to Hardy’s recognition, Ramanujan was eventually elected to the Royal Society of London.
来源：精选题库 549人已做 650难度 64.3%正确率
In the figure shown, is || ?(1) r = s(2) t = u
来源：OG21新题 536人已做 600难度 91.2%正确率
In the figure above, ABCD is a parallelogram and E is the midpoint of side AD. The area of triangular region ABE is what fraction of the area of quadrilateral region BCDE ?
来源：OG21新题 469人已做 其他难度 63.5%正确率
Did the population of Town C increase by at least 100 percent from the year 2000 to the year 2010 ?(1)The population of Town C in 2000 was 2/3 of the population in 2005.(2)The population of Town C increase by a greater number of people from 2005 to 2010 than it did from 2000 to 2005
来源：OG21新题 480人已做 其他难度 74%正确率
The outer dimensions of a closed rectangular cardboard box are 8 centimeters by 10 centimeters by 12 centimeters, and the six sides of the box are uniformly centimeter thick. A closed canister in the shape of a right circular cylinder is to be placed inside the box so that it stands upright when the box rests on one of its sides. Of all such canisters that would fit, what is the outer radius, in centimeters, of the canister that occupies the maximum volume?
来源：OG21新题 464人已做 其他难度 50.9%正确率
If the length of a diagonal of a square is , what is the area of the square in terms of x ?
来源：OG21新题 471人已做 其他难度 89.6%正确率
Last year Brand X shoes were sold by dealers in 403 different regions worldwide, with an average (arithmetic mean) of 98 dealers per region. If last year these dealers sold an average of 2,488 pairs of Brand X shoes per dealer, which of the following is closest to the total number of pairs of Brand X shoes sold last year by the dealers worldwide?
来源：OG21新题 465人已做 其他难度 80.2%正确率
Carol purchased one basket of fruit consisting of 4 apples and 2 oranges and another basket of fruit consisting of 3 apples and 5 oranges. Carol is to select one piece of fruit at random from each of the two baskets. What is the probability that one of the two pieces of fruit selected will be an apple and the other will be an orange?
来源：OG21新题 467人已做 其他难度 88.4%正确率
If the units digit of is 6, what is the value of k ?
来源：OG21新题 498人已做 其他难度 74.1%正确率
A certain state’s milk production was 980 million pounds in 2007 and 2.7 billion pounds in 2014. Approximately how many more million gallons of milk did the state produce in 2014 than in 2007 ? (1 billion = and 1 gallon = 8.6 pounds.)
来源：OG21新题 547人已做 其他难度 79.3%正确率
The use of gravity waves, which do not interact with matter in the way electromagnetic waves do, hopefully will enable astronomers to study the actual formation of black holes and neutron stars.
The amount of time it takes for most of a worker's occupational knowledge and skills to become obsolete has been declining because of the introduction of advanced manufacturing technology (AMT). Given the rate at which AMTis currently being introduced in manufacturing, the average worker's old skills become obsolete and new skills are required within as little as five years. Which of the following plans, if feasible, would allow a company to prepare most effectively for the rapid obsolescence of skills described above?
An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
If a < y < z < b, is |y - a | < |y - b | ?(1) |z - a | < |z - b |(2) |y - a | < |z - b |
Lines n and p lie in the xy-plane. Is the slope of line n less than the slope of line p ?(1) Lines n and p intersect at the point (5,1). (2) The y-intercept of line n is greater than the y-intercept of line p.
In the xy-plane, does the line with equation y = 3x + 2 contain the point (r, s) ? (1) (3r + 2 - s)(4r + 9 - s) = 0 (2) (4r - 6 - s)(3r + 2 - s) = 0
【OG20-P794-806题】Over the past ten years cultivated sunflowers have become a major commercial crop, second only to soybeans as a source of vegetable oil.
Displays of the aurora borealis, or “northern fights,” can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles, induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.
Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.Fact: over 95 percent of people who have asthma also suffer from hay fever. If the information given as facts above is true, which of the following must also be true?
Data gathered by weather satellites has been analyzed by scientists, reporting that the Earth's northern latitudes have become about ten percent greener since 1980, due to more vigorous plant growth associated with warmer temperatures and higher levels of atmospheric carbon dioxide.