Understanding Proportional Relationships: A Grade 7 Math Concept

In the USA, seventh graders often encounter proportional relationships in their math curriculum. Understanding the relationship between the number of items and their cost is crucial. When 10 candies cost $5, finding the cost of 15 candies involves simple proportions.

Using the formula:

[ \text{Cost} \times \frac{\text{Quantity}_1}{\text{Quantity}_2} = \text{Cost of 15 candies} ]

By substituting the given values, we find:

[ 5 \times \frac{10}{15} = \text{Cost of 15 candies} ]

Hence, the cost of 15 candies is $7.50. Understanding proportional relationships is vital for real-life problem-solving.