【OG20-P286-381题】 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 1/3 of the selling price.
Rates for having a manuscript typed at a certain typing service are $5 per page for the first time a page is typed and $3 per page each time a page is revised. If a certain manuscript has 100 pages, of which 40 were revised only once, 10 were revised twice, and the rest required no revisions, what was the total cost of having the manuscript typed?
【OG20-P587-693题】Birds have been said to be descended from certain birdlike dinosaur species with which they share distinctive structural features. The fossil record, however, shows that this cannot be so, since there are bird fossils that are much older than the earliest birdlike dinosaur fossils that have been found.Which of the following is an assumption on which the argument relies?
The cathedrals of the Middle Ages were community centers just as much as they were purelyreligious edifices; and they were structures that represented a city’s commitment to a public realm,the opposite of being a private one.
Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.Which of the following, if true, most strengthens the argument above?
【OG20-P281-329题】A six-sided mosaic contains 24 triangular pieces of tile of the same size and shape, as shown in the figure above. If the sections of tile fit together perfectly, how many square centimeters of tile are in the mosaic.1.Each side of each triangular piece of tile is 9 centimeters long.2.The mosaic can be put inside a rectangular frame that is 40 centimeters wide.
A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
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