Roblox Themed Money Investment Math - Algebra

This one-time Roblox themed class will teach money investment problems  We do not play Robox during class time.  

If one is challenged by this question, then please take my class:  Two sums of money were invested at 13% and 15%, respectively.  The amount invested at 15% was twice the amount invested at 13%.  The total annual income from the two investments was $227.90.  How much was invested at each rate?

The class is structured by going over numerous worked problems, step-by-step, on the whiteboard share-screen on zoom.  I will teach by showing an example, then asking each student in class what the next step is on the following problem.  We work for 5-7 minutes then we break  During these breaks we talk and take an online quiz about Roblox.  My teaching style is to place the students in a successful position to understand and then apply the math investment skills.  The students will interact with me and each other by going over worked solutions of the investment problems.  The knowledge required for this money investment class is changing percent to decimal, understand variables, combine like terms, and solve equations.