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OG12 OG15 OG16 OG17 OG18 At a certain school, the ratio of the number of second graders to the number of fourth graders is 8 to 5, and the ratio of the number of first graders to the number of second graders is 3 to 4. If the ratio of the number of third graders to the number of fourth graders is 3 to 2, what is the ratio of the number of first graders to the number of third graders?
A call center responds to telephone inquiries between the hours of 9 am and 12 pm. Including the idle time, on average, it takes 1.5 minutes to answer an inquiry between 9 and 10 in the morning, 4.5 minutes between 10 and 11, and 5 minutes between 11 and 12. What is the fraction of total inquiries answered between 9 and 12 that the call center, on average, responds to between 9 and 10 in the morning?
Manhattan A study of kindergarten students has shown that children from households that own many books, an average of 54 books, show average or high reading achievement levels, while the households of children with lower reading achievement levels tend to own fewer books, 5 books on average.What additional information would strengthen the assertion that parents who don't buy children's books to keep in the home cause their children to fall behind their peers in reading skills?
Magoosh The impact of a large meteor nearly 65 million years ago can better account for the series of cataclysmic events attending the extinction of the dinosaurs than can the concomitant changes in the Earth's climate alone, based on the fact that the meteorite can best explain the sudden appearance of high concentrations of the element iridium, which is found in meteors and, in and of itself, in no way related to changes in the terrestrial climate.
OG19-数学分册 If the total price of n equally priced shares of a certain stock was $12,000, what was the price per share of the stock? (1) If the price per share of the stock had been $1 more, the total price of the n shares would have been $300 more. (2) If the price per share of the stock had been $2 less, the total price of the n shares would have been 5 percent less.
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Tom has bushels of wheat, bushels of rice, and bushels of quinoa. He wants to order sacks of a single size such that he can fill each sack completely full of one type of grain without having any extra grain left over. What is the minimum number of sacks that Tom must order?
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In a courtyard, one bell rings every \tfrac{1}{4} hour and another bell rings every \tfrac{1}{5} hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all of the intervals that occur between any two rings of the bells, in minutes?
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A certain right triangle has side lengths , , and , where . If the area of this triangular region is , which of the following is the value of ?
300难题 A $10 bill (1,000 cents) was replaced with 50 coins having the same total value. The only coins used were 5-cent coins, 10-cent coins, 25-cent coins, and 50-cent coins. How many 5-cent coins were used? 1.Exactly 10 of the coins were 25-cent coins and exactly 10 of the coins were 50-cent coins. 2.The number of 10-cent coins was twice the number of 5-cent coins.
300难题 Alan and Sue have each been saving one dollar a day and will continue to do so for the next month. If Sue began saving several days before Alan, in how many days from today will Alan have saved one-half as much as Sue? 1.As of today, Alan has saved 7 dollars and Sue has saved 27 dollars. 2.Three days from today, Alan will have saved one-third as much as Sue.
模考带练机经题 A survey is about the situation of watching television among 100 people. There are 60 people watching sports program, 35 people watching the news program, and 40 people watching other programs. 10 people watch all the programs, and 5 people do not watch any programs. There are 10 people just watching two programs: the news and sports program, and 4 people just watching two programs: sports and other programs. How many people just watch one program: other shows?
The Mediterranean Sea sedimentary record reveals intermittent black sediment layers that seem to represent environmental changes over time. These layers, darkened by organic matter, rare in most ocean sediments, indicate the presence of a strong, physical control. Some geologists credit "reverse circulation," wherein waters flowing inward from the Atlantic Ocean are flushed back out in a reverse flow by the constant influx of fresh water from the several rivers that feed the sea. As surface waters evaporate, the heavily salted remnant, containing less dissolved oxygen, sinks. During intensely wet periods, soil nutrients fertilize the surface, phytoplankton production increases, and evaporation dissipates, creating an organically rich environment.However, sedimentary records show bottom-dwellers coexisting with the dark layers were oxygen-stressed, so, reverse circulation could not have existed. Milankovitch Cycles, associated with earth-sun positional relationships, which change the dates of the equinoxes/solstices in 20,000 year cycles, are more likely. Climatic effects include intense rainy seasons depending on the earth's tilt, orbital eccentricity, and distance from the sun. Additionally, the 20,000 year cycles match the spacing of dark layers in the Mediterranean record.
OG15 OG16 OG17 The following appeared in a memorandum from the vice president of Road Food, an international chain of fast-food restaurants:"This past year, we spent almost as much on advertising as did our main competitor, Street Eats, which has fewer restaurants than we do. Although it appeared at first that our advertising agency had created a campaign along the lines we suggested, in fact our total profits were lower than those of Street Eats. In order to motivate our advertising agency to perform better, we should start basing the amount that we pay it on how much total profit we make each year."Discuss how well reasoned you find this argument. In your discussion be sure to analyze the line of reasoning and the use of evidence in the argument. For example, you may need to consider what questionable assumptions underlie the thinking and what alternative explanations or counterexamples might weaken the conclusion. You can also discuss what sort of evidence would strengthen or refute the argument, what changes in the argument would make it more logically sound, and what, if anything, would help you better evaluate its conclusion.
In the two decades between 1910 and 1930, more than ten percent of the black population of the United States left the South, where the preponderance of the black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of the cotton industry following the boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants' subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.But the question of who actually left the South has never been rigorously investigated. Although numerous investigations document an exodus from rural southern areas to southern cities prior to the Great Migration, no one has considered whether the same migrants then moved on to northern cities. In 1910 more than 600,000 black workers, or ten percent of the black workforce, reported themselves to be engaged in "manufacturing and mechanical pursuits," the federal census category roughly encompassing the entire industrial sector. The Great Migration could easily have been made up entirely of this group and their families. It is perhaps surprising to argue that an employed population could be enticed to move, but an explanation lies in the labor conditions then prevalent in the South.About thirty-five percent of the urban black population in the South was engaged in skilled trades. Some were from the old artisan class of slavery—blacksmiths, masons, carpenters—which had had a monopoly of certain trades, but they were gradually being pushed out by competition, mechanization, and obsolescence. The remaining sixty-five percent, more recently urbanized, worked in newly developed industries—tobacco, lumber, coal and iron manufacture, and railroads. Wages in the South, however, were low, and black workers were aware, through labor recruiters and the black press, that they could earn more even as unskilled workers in the North than they could as artisans in the South. After the boll weevil infestation, urban black workers faced competition from the continuing influx of both black and white rural workers, who were driven to undercut the wages formerly paid for industrial jobs. Thus, a move north would be seen as advantageous to a group that was already urbanized and steadily employed, and the [line:58][hl:5]easy conclusion[/hl:5][/line:58] tying their subsequent economic problems in the North to their rural background comes into question.
Many managers are influenced by dangerous myths about pay that lead to counterproductive decisions about how their companies compensate employees. One such myth is that labor rates, the rate per hour paid to workers, are identical with labor costs, the money spent on labor in relation to the productivity of the labor force. This [hl:5]myth[/hl:5] leads to the assumption that a company can simply lower its labor costs by cutting wages. But labor costs and labor rates are not in fact the same: one company could pay its workers considerably more than another and yet have lower labor costs if that company's productivity were higher due to the talent of its workforce, the efficiency of its work processes, or other factors. The confusion of costs with rates persists partly because labor rates are a convenient target for managers who want to make an impact on their com- pany's budgets. Because labor rates are highly visible, managers can easily compare their company's rates with those of competitors. Furthermore, labor rates often appear to be a company's most malleable financial variable: cutting wages appears an easier way to control costs than such options as reconfiguring work processes or altering product design.The myth that labor rates and labor costs are equivalent is supported by business journalists, who frequently confound the two. For example, prominent business journals often remark on the "high" cost of German labor, citing as evidence the average amount paid to German workers. The myth is also perpetuated by the compensation-consulting industry, which has its own incentives to keep such myths alive. First, although some of these consulting firms have recently broadened their practices beyond the area of compensation, their mainstay continues to be advising companies on changing their compensation practices. Suggesting that a company's performance can be improved in some other way than by altering its pay system may be empirically correct but contrary to the consultants' interests. Furthermore, changes to the compensation system may appear to be simpler to implement than changes to other aspects of an organization, so managers are more likely to find such advice from consultants palatable. Finally, to the extant that changes in compensation create new problems, the consultants will continue to have work solving the problems that result from their advice.
GMAT、gmat题库、gmat模考、gmat考满分The graph shows the distributions of scores on official driving tests administered within a certain municipality for eight consecutive business days. Select from each drop-down menu the option that creates the most accurate statement, given the information provided. 13A The graph provides enough information to determine that the 13B over all of the days indicated in the graph is the same as that for combined.
OG12 GMAT、gmat题库、gmat模考、gmat考满分The figure above shows the circular cross section of a concrete water pipe. If the inside radius of the pipe is r feet and the outside radius of the pipe is t feet, what is the value of r ?(1)The ratio of t - r to r is 0.15 and t - r is equal to 0.3 foot.(2)The area of the concrete in the cross section is 1.29π square feet.
OG16 GMAT、gmat题库、gmat模考、gmat考满分The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?(1)Of the boys in the class, 15 are studying biology.(2)The number of girls in the class is twice the number of students in the class who are not studying biology.
PREP07 Test 1 Malik's recipe for 4 servings of a certain dish requires 1.5 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.(2) Malik used 6 cups of pasta the last time he prepared this dish.
OG16 OG17 OG18 OG19 OG20 OG2022 Advertisement: When your car's engine is running at its normal operating temperature, any major brand of motor oil will protect it about as well as Tuff does. When the engine is cold, it is a different story: Tuff motor oil flows better at lower temperatures than its major competitors do. So, if you want your car's engine to have maximum protection, you should use Tuff.which of the following, if true, most strengthens the argument in the advertisement?