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300难题
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If $$ k\neq 0$$ and k- $$\frac{3-2k^{2}}{k}$$ =$$\frac{x}{k}$$ , then x=
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300难题
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If $$\frac{s}{t}$$= 2, then the value of which of the following can be determined?
I $$\frac{2t}{s}$$
II $$\frac{s-t}{t}$$
Ill $$\frac{t-1}{s-1}$$
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300难题
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If d=$$\frac{a+b}{1+\frac{ab}{c^{2}}}$$ ,a=$$\frac{c}{2}$$,and b=$$\frac{3c}{4}$$,what is the value of d in terms of c ?
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300难题
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If each side of △ACD above has length 3 and if AB has length 1, what is the area of region BCDE?
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300难题
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A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the larger rim make in terms of x ?
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300难题
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The annual stockholders' report for Corporation X stated that profits were up 10 percent over the previous year, although profits as a percent of sales were down 10 percent. Total sales for that year were approximately what percent of sales for the previous year?
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300难题
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The table above shows the percent of change from the previous month in Company X's sales for February through June of last year. A positive percent indicates that Company X's sales for that month increased from the sales for the previous month, and a negative percent indicates that Company X's sales for that month decreased from the sales for the previoos month, For which month were the sales closest to the sales in January?
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300难题
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A certain brand of house paint must be purchased either in quarts at $ 12 each or in gallons at $18 each. A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white. What is the least amount of money needed to purchase sufficient quantities of the two colors to make the mixture?
(4 quarts = 1 gallon)
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300难题
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A store bought 5 dozen lamps at $30 per dozen and sold them all at $15 per lamp. The profit on each lamp was what percent of its selling price?
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300难题
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A merchant purchased a jacket for $60 and then determined a selling price that equaled the purchase price of the jacket plus a markup that was 25 percent of the selling price. During a sale, the merchant discounted the selling price by 20 percent and sold the jacket. What was the merchant's gross profit on this sale?
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300难题
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How many positive integers n have the property that both 3n and n/3 are 4-digit integers?
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300难题
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If Whitney wrote the decimal representations for the first 300 positive integer multiples of 5 and did not write any other numbers, how many times would she have written the digit 5 ?
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300难题
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An “Armstrong numbe” is an n-digit number that is equal to the sum of the nth powers of its individual digits. For example, 153 is an Armstrong number because it has 3 digits and $$1^{3}+ 5^{3} + 3^{3}$$= 153. What is the digit k in the Armstrong number 1,6k 4 ?
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300难题
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Which of the following describes the set of all possible values of the positive integer k such that, for each positive odd integer n. the value of $$\frac{n}{k}$$ is midway between consecutive integers?
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300难题
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When the integer n is divided by 17, the quotient is x and the remainder is 5.When n is divided by 23, the quotient is y and the remainder is 14. Which of the following is true?
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300难题
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A fossil recently discovered in Marlandia, a chain of islands, proves that a present-day reptile indigenous to Marlandia is descended from an ancient reptile species that lived on the islands millions of years ago. The finding is surprising since the ancestral species was thought to have become extinct when Marlandia was submerged in a global sea-level rise twenty-five million years ago. Based on the new discovery, many scientists have concluded that the sea-level rise in question left at least part of Marlandia unsubmerged.
Which of the following would, if true, provide the most additional support for the scientists' conclusion?
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300难题
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Columnist: Metro City has a lower percentage of residents with humanities degrees than any other city of comparable size in our nation. Nationwide, university graduates generally earn more than people who are not university graduates, but those with humanities degrees typically earn less than do graduates with degrees in other disciplines. So the main reason Metro City has higher income per capita than any other city of comparable size in our nation must be its low percentage of residents with humanities degrees.
Which of the following, if true, would most strengthen the columnist's argument?
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300难题
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Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose, instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.
Which of the following, if true, gives the strongest support to the argument above about our oil reserves?
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300难题
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In the United States, injuries to passengers involved in automobile accidents are typically more severe than in Europe, where laws require a different kind of safety belt. It is clear from this that the United States needs to adopt more stringent standards for safety belt design to protect automobile passengers better.
Each of the following, if true, weakens the argument above EXCEPT:
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300难题
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The contingency-fee system, which allows lawyers and their clients to agree that the lawyer will be paid only in the event of success, does not increase the number of medical malpractice lawsuits brought against doctors. As attorneys must cover the costs for their time and research,they want to be assured that any medical malpractice case they accept on a contingency-fee basis has substantial merit. Consequently, attorneys turn away many people who come to see them, for lack of a good case.
The argument above is most vulnerable to criticism on the grounds that it fails to
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