FrequentlyLost

Hi, everyone. I'm an LPN student on her first semester. Each semester we'll have a math competency test, and I have no experience with dosing calculations. We've kinda been thrown into it with just two packets with problems to solve, without having it explained how to do them, and I'm someone that has a lot of issues with math (I'm literally having to re-learn long division). Could someone help me out with the proper formulas for finding drug/solutes in solution, preparing feeding tubes, expressing solution strength, and # of tabs, caps, or mL to prepare? I'm kinda running blind here and every website or video I've found so far has different names for all of it, and I can't recognize which one is which.