单选题 In the Senate, if 20 male senators were replaced by 20 female senators, the ratio of male senators to female senators would be
  • A. 4 to 1
  • B. 3 to 1
  • C. 3 to 2
  • D. 2 to 1
  • E. 1 to 1
【正确答案】 B
【答案解析】If 20 male senators were replaced by 20 female senators, then there would be 75 male senators (95-20) and 25 female senators (5+20). The ratio would be 75 to 25, which can be reduced to 3 to 1.
单选题 Approximately what percent of the members of Congress belong to the Democratic Party?
  • A. 54%
  • B. 62%
  • C. 70%
  • D. 72%
  • E. 76%
【正确答案】 B
【答案解析】There are a total of 330 Democrats in Congress (276 in the House of Representatives and 54 in the Senate). There are a total of 535 members of Congress. So 330/535, or approximately 62% of the members of Congress belong to the Democratic Party.
多选题 Which of the following can be inferred from the information given in the chart?
Indicate {{U}}all{{/U}} such statements.
  • A. More than 75 percent of the lawyers in Congress are members of the House of Representatives.
  • B. There are more female educators in the Senate than in the House of Representatives.
  • C. On average, members of the Senate are older than members of the House of Representatives.
【正确答案】 A、C
【答案解析】According to the table, there are 346 lawyers in Congress, and 272 of them are in the House of Representatives. [*] is approximately 0.79, or 79%, so Statement A can be inferred. Because the educators are not divided into groups of male or female, you cannot determine if there are more female educators in one branch of Congress over another. Therefore, Statement B cannot be inferred. According to the table, members of the House of Representatives range in age from 29 to 74 (average age=44), while members of the Senate range in age from 32 to 79 (average age = 56). Therefore, Statement C can be inferred.
单选题 Approximately what fraction of the members of House of Representatives is Farmers or Ranchers? A. B. C. D. E.
【正确答案】 C
【答案解析】To solve this problem, first note that there are 435 total members of the House of Representatives. According to the graph, 9 of these people are Farmers or Ranchers.
单选题 Based on the graph shown, what was the average yearly decrease in the price of polyester between 1994 and 1998, inclusive?
【正确答案】 A
【答案解析】To find the average yearly decrease, first find the total decrease over the 4 years. In 1994 the total price of polyester was approximately $35,000, and in 1998, it was approximately $30,000. So the difference is $5,000. Now, to find the average, divide by 4 years: 5,000+4=1,250.
单选题 In triangle ABC, what is the value of y?
【正确答案】
【答案解析】To solve this problem, first calculate the value of the third angle in the triangle. Because the angle is adjacent to a 105°, its measure must be 75°. Therefore, y must equal 180-75-35=70.
填空题 WINK, Inc. is made up of 450 employees who work a total of 13,500 hours per week. If the number of weekly work hours per person has a normal distribution and the standard deviation equals 7 hours, how many employees work more than 37 hours per week?