Algebra-1

Question Analysis
This question assesses the student's ability to use proportional relationships to solve a problem. The problem involves finding the number of pencils when the number of erasers is given and the ratio of pencils to erasers is known.

Key Concept Explanation
Proportional relationships are used to maintain a constant ratio between two quantities. In this case, the ratio of pencils to erasers is 7:3. By setting up a proportion, we can find the number of pencils corresponding to a given number of erasers.

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

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