This topic practices advanced algebra concepts that relate to simple substitution within the context of solving for the cost of meals composed of multiple items. Each problem involves determining the compound cost of a meal by substituting and calculating based on given values for individual meal items. The problems are structured into multiple-choice format, each providing a pair of possible answers for students to select from. This aims to teach and enhance students' abilities to perform algebraic manipulations and apply basic algebraic concepts in practical, everyday contexts like calculating meal costs.