If 5 pencils cost $1.50, how much would 20 pencils cost? The...

Question Analysis
This question tests the student's ability to set up and solve a proportion problem. The key is to recognize that the cost of pencils is directly proportional to the number of pencils.

Key Concept Explanation
Proportions are equations stating that two ratios are equal. In this case, the ratio of the number of pencils to their cost is constant.

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

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Algebra-1

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