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题目内容
If the number of students in grades 9 through 12 comprised 35 percent of the number of students in School District X in 1975, then approximately how many students were in School District X in 1975 ?
Assume that all students in School District X took the reading test each year. In 1993, approximately how many more ninth grade students had reading test scores in the 70–79 point range than in the 80–89 point range?
Quantity A
$$2-\frac{27}{25}$$
Quantity B
$$\frac{3}{5}+\frac{12}{125}$$
Solution X contains only ingredients a and b in a ratio of 2 : 3. Solution Y contains only ingredients a and b in a ratio of 1 : 2. If Solution Z is created by mixing solutions X and Y in a ratio of 3 : 11, then 630 ounces of Solution Z contains how many ounces of a ?
On Sunday, Belmond Public Library has 160 books, none of which have been checked out. On Monday, 40 of the books are checked out. On Tuesday,$$\frac{1}{2}$$of the borrowed books are returned. Wednesday,$$\frac{1}{2}$$of the books still checked out are returned and then 20 more are checked out. On Thursday, a wealthy patron donates 80 books, and$$\frac{1}{6}$$of the books still checked out are returned. On Friday 30 more books are borrowed, and on Saturday 35 are checked out. What is the percent change from the books in the library at the end of the day on Monday to the books in the library at end of the day the following Saturday
_____percent
Jill has received 8 of her 12 evaluation scores. So far, Jill`s average (arithmetic mean) is 3.75 out of a possible 5. If Jill needs an average of 4.0 points to get a promotion, which set of scores will allow Jill to receive her promotion?
Indicate all possible answers.
What is the approximate percent increase from the lowest average temperature for Years X and Y to the highest average temperature?
If the average temperature for Years X and Y in Baltimore is equal to the average of that city`s high and low temperatures for each of those years, then what is the average of the low temperatures for Baltimore in Years X and Y ?
In which of the following years did subscriptions to Newsmagazine z account for approximately$$\frac{1}{6}$$of the total nationwide magazine subscriptions?
What was the approximate percent increase in nationwide subscriptions to newsmagazines between 1970 and 1971?
In 1973, what was the approximate number of subscriptions to newsmagazines nationwide?
From September 1985 to December 1989, what was the approximate ratio of private donations in millions to homeless aid to private donations in millions to animal rights?
Which of the following charitable causes received the smallest percent increase in private donations from September 1989 to October 1989?
In Year x, for which continent was the ratio of electricity production to population the greatest?
In Year x, if South America had a population of approximately 368 million, what was the approximate population, in millions, of Africa?
In 1995 there were 95 million television households in the United States. If, in 1983, there were 80 percent of the number of television households in 1995, then approximately how many television households in millions viewed Program y in 1983 ?
Approximately what was the average number of television households in the United States that viewed Program x from 1981 through 1985 inclusive?
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