Final answer:
The relationship between the money contributed by Anna's aunt and brother could be directly proportional, inversely proportional, or have no relationship, depending on specific details not provided.
Step-by-step explanation:
The relationship between the amount of money Anna's aunt contributes and the amount Anna's brother contributes can be directly proportional, inversely proportional, or have no relationship. To determine which, we need to understand the concepts of proportionality. Directly proportional means that as one variable increases, the other one also increases at a consistent rate (more-more relationship), which can be expressed with the equation y = kx, where k is the proportionality constant. On the other hand, inversely proportional means that as one variable increases, the other decreases (more-less relationship), and is illustrated by the equation y = k/x, where k remains constant as x and y change. Without additional context, it's not possible to answer definitively, as any of these relationships could apply depending on the specific details of the situation.