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题目： A division of a company consists of seven men and five women. If three of these twelve employees are randomly selected as representatives of the division, what is the probability that the representatives will consist of two females and one male?

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题目： The ratio of two positive numbers is 3 to 4. If k is added to each number the new ratio will be 4 to 5, and the sum of the numbers will be 117. What is the value of k?

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题目： While driving from A-ville to B-town, Harriet drove at a constant speed of 115 kilometers per hour. Upon arriving in B-town, Harriet immediately turned and drove back to A-ville at a constant speed of 135 kilometers per hour. If the entire trip took 5 hours, how many minutes did it take Harriet to drive from A-ville to B-town?

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题目： If $$f(x) = x^{4} - 3x^{3}- 2x^{2} + 5x $$, then f(-1) =

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题目： If $$\frac{x}{3} + \frac{x}{4} + 15 = x$$, then x =

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题目： In the diagram, AE = 20, AD = 14, CD = 6 and EB = 17. What is the length of line segment BC?Note: Figure not drawn to scale

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题目： A shipment of watermelons weighs 899 pounds. If each watermelon weighs at least 15 pounds, what is the greatest number of watermelons that could be in the shipment?

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题目： If 2x - y = 10 and$$ \frac{x}{y} = 3$$, then x =

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题目： Walking at a constant rate of 8 kilometers per hour, Juan can cross a bridge in 6 minutes. What is the length of the bridge in meters? (1 kilometer = 1000 meters)

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题目： If$$8^{5}x4^{6}\over16^{n}$$=$$32^{1-n}$$then n=

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题目： If square ABCD has area 25, and the area of the larger shaded square is 9 times the area of the smaller shaded square, what is the length of one side of the smaller shaded square?Note: Figure not drawn to scale

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题目： In the figure below, ∠ADE = 60°, ∠EFC = 40°, and ∠DAE = 55°. If AB || CD, what is the value of x?Note: Figure not drawn to scale

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题目： $${1}\over{1+{{1}\over1-\frac{1}{3}}}$$

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题目： If$$ 2^{k} = 3, then 2^{3k+2} =$$

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题目： Which of the following is the correct ordering of $$2\sqrt{13},4\sqrt{3},5\sqrt{2}$$ and$$3\sqrt{6}$$ ?