2011 AMC 8 Problems/Problem 6
Problem
In a town of 
adults, every adult owns a car, motorcycle, or both. If 
adults own cars and 
adults own motorcycles, how many of the car owners do not own a motorcycle?
Solution 1
By PIE, the number of adults who own both cars and motorcycles is 
Out of the car owners, 
of them own motorcycles and 
of them don't.
Solution 2
There are total adults, and own a motorcycle. The number of adults that don't own a motorcycle is 
. Since everyone owns a car or motorcycle and one who doesn't own a motorcycle owns a car, the answer is 
.
Solution 3
Note that since there are some adults that own both, we can eliminate answer choice 
. It is fairly obvious that the answer must be in the 300 range, giving us 
See Also
| 2011 AMC 8 (Problems • Answer Key • Resources) | ||
| Preceded by Problem 5 |
Followed by Problem 7 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
