1. The problem statement, all variables and given/known data 2. Relevant equations Series: Req = r1 + r2... Parallel: 1/req = 1/r1 + 1/r2... 3. The attempt at a solution This is my professors solution for the problem and of course without any explanation it doesn't make sense to me. Under what principle can he justify immediately adding 10 + 8? For my solution I redrew the circuit and did: 5||20 = 4 10+4 = 14 3 || 6 = 2 2+8 = 10 10+14 = 24 Another question: Had I not redrawn the circuit I still would've gotten 14 and 10 but I would've thought they would be in parallel with each other with the way its drawn out? I understand redrawing it is the easiest way to make sure I have it correct but there won't be enough time unless I immediately recognize what it looks like.