The first assignment is for students to practice using a proportional relationship's input and output values to find the constant of proportionality and then write the relationship's equation.
The second assignment is one of many proportional relationship challenge problems that I use. Students can work on it individually, with a partner, or with a team. It is designed to not only challenge the students to use most aspects and representations of proportional relationships, but it is also a great tool to push the students forward in their critical thinking skills. It is written in a way that students normally cringe, jump, or smile. In addition, you as the teacher will get to watch their reactions, make fun of them, and possibly give them hints or slight nudges if they get stuck in their thinking.