Final answer:
The student's question requires subtracting the cost of lunch from Avery's initial amount of $25.40 to find the remaining balance. However, the cost of lunch is not provided, making it impossible to solve. To illustrate, assuming the lunch costs $5.40, Avery would have $20.00 left.
Step-by-step explanation:
The question posed by the student involves a simple subtraction problem, where Avery has an initial amount of money ($25.40) and spends a portion of it on lunch. However, to calculate the amount of money Avery has left after buying lunch, we require the cost of the lunch, which has not been provided in the question. Without this piece of information, we cannot determine the exact amount remaining in Avery's wallet post-lunch.
Understanding how to manage and calculate expenses is an essential everyday math skill. For instance, if we assume that lunch costs $5.40, then Avery would subtract this amount from her initial $25.40 to determine her remaining balance. The calculation would be $25.40 - $5.40 = $20.00. This is a straightforward subtraction problem that reinforces basic arithmetic skills pertinent to scenarios involving money and budgeting—skills that are valuable for students to acquire.
Discussions related to currency, like the average amount of U.S. currency in circulation per person, might interest students in logical thinking and understanding of economics, although these concepts are not directly relevant to the original subtraction problem.