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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$$3\sqrt{6}$$ ?

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题目： In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?