The cost of buying apples varies directly with the number of apples purchased. If 5 apples cost $3, how much will 15 apples cost?
The cost of 15 apples is ________dollars.
Answer & Analysis
Analysis
Question Analysis
This question tests the student's ability to apply the concept of direct variation to a real-world scenario involving cost and quantity. The key is to recognize that the cost varies directly with the number of apples.
Key Concept Explanation
In direct variation, the relationship between two variables is given by . Here, the cost varies directly with the number of apples , so .
Step-by-step Solution
1. Use the given values dollars and apples to find :
2. Solve for
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