Algebra-1

Question Analysis
This question tests the student's ability to set up and solve a system of equations based on a word problem. The key is to translate the given information into a mathematical equation and then solve it.

Key Concept Explanation
The problem involves setting up an equation based on the relationship between the number of fiction and non-fiction books. The total number of books is given, and the relationship between the quantities is provided.

Step-by-step Solution
1. Let be the number of fiction books,  be the number of non-fiction books. So f + n = 120
2. The number of non-fiction books is 20 more than the number of fiction books, so the number of non-fiction books is n = .
3. The total number of fiction and non-fiction books is 120, so the equation is .
4. Simplify the equation:

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