这些是前面SAT数学解析答案，不知道SAT考试考生看了有什么感觉。

1.The correct answer is D

Let equal the population of Norson, and let equal the entire population of Transitania. Then is the population of the rest of Transitania. is of . or .This gives , or .So the population of Norson is one third, or , of the entire population of Transitania.

2.The correct answer is C

Choice (C) is correct. Since 4 = 2^2, it follows that 4^b = (2^2)^b = 2^(2 times b). Therefore, 2^a = 4^b = 2^(2 times b), from which it follows that a = 2 times b.

3.The correct answer is E

First, add the labeled points , , , , , and to the figure, as shown above. Then segment bisects , so , and . Thus, . Similarly, , because and are of equal measure and the sum of their measures is . From the figure, it follows that . Therefore, .

4.The correct answer is B

From the information given, you can write the proportion 3 cars is to 4 hours as 5 cars is to x hours, where x represents the number of  hours the mechanic will take to install carburetors in 5 cars. This gives 3 cars over 4 hours = 5 cars over x hours, which simplifies to 3 times x = 4 times 5 = 20. Therefore, x = 20 over 3 = 6 and (2 over 3) hours. Since 2 over 3 hour is 40 minutes, x is 6 hours 40 minutes.