主题：[The Official SAT Question of the Day™] January 30th Friday

Hint : If each of the ten cars contained exactly 2 people, there would be a total of only 20 people. If nine of the cars contained exactly 2 people, the remaining car could have no more than 4 people, for a total of only 22. What if eight cars contained exactly 2 people? Try to find a pattern.

Correct Answer: D

• Here's Why: It could not be true that each of the ten cars contained exactly 2 people, as this would give a total of only 20. If nine of the cars contained exactly 2 people, the remaining car could have no more than 4 people, for a total of only 22. Continuing in the same way, a pattern develops. If eight of the cars contained exactly 2 people, the remaining two cars could have no more than 4 people each, for a total of only 24. If seven of the cars contained exactly 2 people, the total number of people could be only 26. From the pattern, you can see that if four of the cars contained exactly 2 people, and the remaining six cars contained the maximum of 4 people, the total number would be 32, as given in the question. Therefore, at most four of the ten cars could have contained exactly 2 people.
  
• Difficulty: Medium
• Question Type: Standard Multiple Choice
  (Mathematics)
  

(1)x+y=10
(2)2x+4y=32
than make out y=6
   x=4