Algebra-1

Question Analysis
This question tests the student's ability to solve a proportion in a real-world context. The given ratio is for boys to girls, and the number of girls is 15.

Key Concept Explanation
Cross-multiplication is a method to solve proportions by multiplying the numerator of one fraction by the denominator of the other and setting the products equal. This method is useful in real-world applications such as ratios in a classroom.

Step-by-step Solution
1. Set up the proportion:
2. Cross-multiply:
3. Simplify:

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