2008 AMC 8 Problems/Problem 11
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Problem
Each of the students in the eighth grade at Lincoln Middle School has one dog or one cat or both a dog and a cat. Twenty students have a dog and students have a cat. How many students have both a dog and a cat?
Solution
The union of two sets is equal to the sum of each set minus their intersection. The number of students that have both a dog and a cat is .
See Also
2008 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 10 |
Followed by Problem 12 | |
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All AJHSME/AMC 8 Problems and Solutions |
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