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OG16 OG17 OG18 OG19 OG20 OG2022
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 The graph of which of the following equations is a straight line that is parallel to line l in the figure above?
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OG15 OG16 OG17 OG18 OG19 OG20 OG2022
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Company P had 15 percent more employees in December than it had in January. If Company P had 460 employees in December, how many employees did it have in January?
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Each of the 30 boxes in a certain shipment weighs either 10 pounds or 20 pounds, and the average (arithmetic mean) weight of the boxes in the shipment is 18 pounds. If the average weight of the boxes in the shipment is to be reduced to 14 pounds by removing some of the 20-pound boxes, how many 20-pound boxes must be removed?
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If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?
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 For the cube shown above, what is the degree measure of ∠PQR?
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Company S produces two kinds of stereos:basic and deluxe. Of the stereos produced by Company S last month, $$\frac2 3$$ were basic and the rest were deluxe. If it takes $$\frac7 5$$ as many hours to produce a deluxe stereo as it does to produce a basic stereo, then the number of hours it took to produce the deluxe stereos last month was what fraction of the total number of hours it took to produce all the stereos?
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In the sequence 1, 2, 4, 8, 16, 32, …, each term after the first is twice the previous term. What is the sum of the 16th, 17th, and 18th terms in the sequence?
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 In the figure above, O is the center of the circle. If the area of the shaded region is 2π, what is the value of x?
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The operation $$\Delta$$ is defined for all nonzero x and y by $${x}\Delta{y}={x}+\frac x y$$. If $$a > 0$$, then $$1\Delta (1\Delta a) =$$
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$$\sqrt{{2\sqrt{63}}+{\frac2 {8+3\sqrt7}}}$$
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OG19-数学分册
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The infinite sequence $${a}_{1}$$, $${a}_{2}$$,..., $${a}_{n}$$,... is such that $${a}_{1}={2}$$, $${a}_{2}=-{3}$$, $${a}_{3}={5}$$, $${a}_{4}=-{1}$$, and $${a}_{n}={a}_{n-4}$$ for $$n > 4$$. What is the sum of the first 97 terms of the sequence?
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The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
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The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?
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 The figure above represents a square garden that is divided into 9 rectangular regions with indicated dimensions in meters. The shaded regions are planted with peas, and the unshaded regions are planted with tomatoes. If the sum of the areas of the regions planted with peas is equal to the sum of the areas of the regions planted with tomatoes, what is the value of x?
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If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?
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If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?
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The author of the passage puts the word "renegade" (line 29) in quotation marks most probably in order to
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It can be inferred from the passage that the researchers mentioned in highlight text would be most likely to agree with which of the following statements?
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The passage is primarily concerned with
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It can be inferred from the passage that which of the following have recently been compared in order to clarify the fundamental classifications of living things?
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