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题目： Sue planted 4 times as many apple seeds as she planted orange seeds. 15 percent of the apple seeds grew into trees, and 10 percent of the orange seeds grew into trees. If a total of 420 apple trees and orange trees grew from the seeds, how many orange seeds did Sue plant?

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题目： If $$x - 5 = \sqrt{2x^{2}-{18x+37}}$$then x could equal

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题目： The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5a + 20. The fifth number is

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题目： Which of the following is a root of the equation$$ 2x^{2} - 20x = 48?$$

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题目： $${2+\sqrt{2}}\over{2-\sqrt{2}}$$

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题目： If a spaceship travels at an average speed of$$ 6x10^{10}$$ kilometers per year, how many years will it take the spaceship to travel $$3x10^{30}$$ kilometers?

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题目： If the average (arithmetic mean) of 3, 8, w, x, and y is 14, then the average of w + 2, x - 3, and y + 8 is

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题目： If $$xy \neq 0$$ and 2x + 3y is equal to 175 percent of 8x, then x/y =

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题目： If 4x - 3y = 13 and 5x + 2y = -1, then x =

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题目： A class consists of 24 students. Which of the following CANNOT be the ratio of the number of girls to the number of boys?

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题目： $${{1}\over{x*\sqrt{3}}}={\sqrt{2}\over{24}}$$In the equation above, x =

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题目： From a total of 5 boys and 4 girls, how many 4-person committees can be selected if the committee must have exactly 2 boys and 2 girls?

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题目： When 12 marbles are added to a rectangular aquarium, the water in the aquarium rises$$ 1\frac{1}{2}$$ inches. In total, how many marbles must be added to the aquarium to raise the water $$ 2\frac{3}{4}$$ inches?

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题目： $$73^{2} + 74^{2} =$$

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题目： $$\sqrt{(49)(137)-(56)(49)}$$