Algebra-1

Question Analysis
This question tests the student's ability to apply cross-multiplication to solve a real-world problem involving a map scale. The given scale is 3 cm on the map representing 15 km in real life.

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 map scales.

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

Click "Show Answer" to reveal the answer and analysis