主题：[The Official SAT Question of the Day™] January 27th Tuesday

Hint : A quick “make-sense” check before you start working on a question can help you eliminate some of the choices right away. If you realize that the actual mileage has to be greater than the registered mileage, you can eliminate choices D and E immediately.

Correct Answer: B

• Here's Why: 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 . This can be expressed as
  

  =

  
  If the odometer indicates 48 miles, the actual miles can be found using using the above relationship as follows:
  =
  2x = 144
  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:
  =
  3x = 96
  x = = 32 miles — Wrong!
  
• Difficulty: Medium
• Question Type: Standard Multiple Choice
  (Mathematics)