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Ready4	If $x$ , $y$ , $b$ , and $t$ are all positive integers, $x=\frac{y}{5}+2$ and $t=\frac{b}{7}+4$ , is $b(t^{xy})$ an even number? (1) $3.5t-2$ is even (2) $\frac{b}{t}$ is even
Ready4	How many even numbers in the range between $10$ and $100$ , inclusive, are not divisible by $3$ ?
Ready4	Broadcast mainly in North America, Indian Americans viewed the television show Outsourced with suspicion, for they believed that the show encouraged racial stereotyping and portrayed Indians in a bad light.
Ready4	Is the integer x odd? (1) x^³ is odd (2) 3x is odd
Ready4	What is the number of integers that are not divisible by 7 in the range of integers from 3 to 500?
Ready4	Given 7 distinct points in a plane such that no 3 points are on a single line, how many distinct quadrilaterals can be formed using these 7 points?
Ready4	If $a$ and $b$ are two positive integers whose greatest common divisor is $1$ , what will be the remainder of $a \div b$ , if $\frac{a}{b}=3.75$ ?
OG20 OG2022	If r and s are positive numbers and θ is one of the operations, +, −, *, or ÷, which operation is θ? 1.If r = s, then r θ s = 0. 2.If r ≠ s, then r θ s ≠ s θ r.
OG20 OG2022	If a merchant purchased a sofa from a manufacturer for $400 and then sold it, what was the selling price of the sofa? 1.The selling price of the sofa was greater than 140 percent of the purchase price. 2.The merchant's gross profit from the purchase and sale of the sofa was $$\frac{1}{3}$$ of the selling price.
OG20 OG2022	A rectangular solid has length, width, and height of L cm, W cm, and H cm, respectively. If these dimensions are increased by x%, y%, and z%, respectively, what is the percentage increase in the total surface area of the solid? 1.L, W, and H are in the ratios of 5:3:4. 2.x = 5, y = 10, z = 20
OG20 OG2022	If a building has 6,000 square meters of floor space, how many offices are in the building? 1.Exactly $$\frac{1}{4}$$ of the floor space is not used for offices. 2.There are exactly 20 executive offices and each of these occupies 3 times as much floor space as the average for all of the remaining offices.
OG20 OG2022	If p, r, and s are consecutive integers in ascending order and x is the average (arithmetic mean) of the three integers, what is the value of x ? 1.Twice x is equal to the sum of p, r, and s. 2.The sum of p, r, and s is zero.
OG20 OG2022	In the figure above, if A, B, and C are the areas, respectively, of the three nonoverlapping regions formed by the intersection of two circles of equal area, what is the value of B + C ? 1.$$A + 2B + C = 24$$ 2.$$A + C = 18$$ and $$B = 3$$
OG20 OG2022	In the figure above, the vertices of ∆OPQ and ∆QRS have coordinates as indicated. Do ∆OPQ and ∆QRS have equal areas? 1.b = 2a 2.d = 2c
OG20 OG2022	If rectangle ABCD is inscribed in the circle above, what is the area of the circular region?
OG20 OG2022	In the floor plan of an executive's beach house above, the north and south walls of the living room are parallel. What is the floor area, in square feet, of the bedroom?
OG20 OG2022	In quadrilateral ABCD above, what is the length of AB ?
	For most species of animals, the number of individuals in the species is inversely proportional to the average body size for members of the species: the smaller the body size, the larger the number of individual animals. The tamarin, a small South American monkey, breaks this rule. Of the ten primate species studied in Peru's Manu National Park, for example, the two species of tamarins, saddle-backed and emperor, are the eighth and ninth least abundant, respectively. Only the pygmy marmoset, which is even smaller, is less abundant. The tamarin's scarcity is not easily explained; it cannot be dismissed as a consequence of diet, because tamarins feed on the same mixture of fruit, nectar, and small prey as do several of their more numerous larger counterparts, including the two capuchins known as the squirrel monkey and the night monkey. Although the relative proportions of fruits consumed varies somewhat among species, it is hard to imagine that such subtle differences are crucial to understanding the relative rarity of tamarins. To emphasize just how anomalously rare tamarins are, we can compare them to the other omnivorous primates in the community.In terms of numbers of individuals per square kilometer, they rank well below the two capuchins, the squirrel monkey and the night monkey. And in terms of biomass, or the total weight of the individuals that occupy a unit area of habitat, each tamarin species is present at only one-twentieth the mass of brown capuchins or one-tenth that of squirrel monkeys. To gain another perspective, consider the spatial requirements of tamarins. Tamarins are rigidly territorial, vigorously expelling any intruders that may stray within the sharply defined boundaries of their domains. Groups invest an appreciable part of their time and energy in patrolling their territorial boundaries, announcing their presence to their neighbors with shrill, sweeping cries. Such concerted territoriality is rather exceptional among primates, though the gibbons and siamangs of Asia show it, as do a few other New World species such as the titi and night monkeys. What is most surprising about tamarin territories is their size. Titi monkeys routinely live within territories of 6 to 8 hectares, and night monkeys seldom defend more than 10 hectares, but tamarin groups routinely occupy areas of 30 to 120 hectares. Contrast this with the 1to 2 hectares needed by the common North American graysquirrel, a nonterritorial mammal of about the same size. A group of tamarins uses about as much space as a troop of brown capuchins, though the latter weighs 15 times as much. Thus, in addition to being rare, tamarins require an amount of space that seems completely out of proportion to their size.
OG20-语文分册	The author indicates that tamarin territories are
OG20-语文分册	The author regards the differences between the diets of the tamarins and several larger species as