SAT每日一题不容小觑 8月29日SAT真题奉上

2013-09-06 17:47:28 来源: 互联网责编：楷维留学指南

楷维留学小编分享分享2013年8月29日SAT考试官方每日一题，每题都附有答案及相对应的答题解析，助力各位SAT备考的同学们。

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SAT考试2013年8月29日官方每日一题

2013年8月29日SAT真题

SAT真题类型：Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　The odometer of a new automobile functions improperly and registers only miles for every miles driven. If the odometer indicates miles, how many miles has the automobile actually been driven?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

2013年8月29日SAT考试官方每日一题答案：B

解析：In this problem, you are told that the odometer registers only miles for every miles driven. So the ratio of miles registered to miles driven is to or 2 over 3 . This can be expressed as

odometer reading over actual miles = 2 over 3

If the odometer indicates miles, the actual miles can be found using using the above relationship as follows:

48 over x = 2 over 3 and 2x = 144 and x=72

So if the odometer indicates miles, the actual number of miles driven is .

How to Avoid Errors When Working with Ratios

The most important thing with ratios is to be consistent in the way you set them up. If you mix up the terms, you won’t get the correct answer. For instance, if you put the registered mileage in the numerator of one ratio but the actual mileage in the numerator of the other ratio, you will come up with a wrong answer: