Algebra-1

Question Analysis
This question tests the student's ability to use proportions to solve a real-world problem. The problem involves finding the number of girls in a class given the ratio of boys to girls and the number of boys.

Key Concept Explanation
Proportions can be used to solve real-world problems involving comparisons and scaling. In this case, the proportion is set up based on the given ratio and the known number of boys.

Step-by-step Solution
1. Identify the given information: The ratio of boys to girls is 3:4, and there are 12 boys.
2. Set up the proportion:
3. Apply the cross-multiplication rule:

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