SAT I 一日一问：2014年10月29日

The correct answer is B

Explanation

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

odometer reading over actual miles = 2 over 3

If the odometer indicates 48 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 48 miles, the actual number of miles driven is 72.

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:

 

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