1. The problem statement, all variables and given/known data 2. Relevant equations Resistors in Series = R1 + R2 + R3... = Req Resistors in Parallel = 1/R1 + 1/R2 + 1/R3 ... = 1/Req 3. The attempt at a solution Studying for a test. This sample exam went pretty well. I am having trouble with 3 out of the 20. I can't figure this one out. The bottom branch can be combined to be Req = 30 + 30 = 60 Ohms From there, I can't seem to find a way to combine the rest. I have the answer (B) but I can't collapse the circuit.