1. The problem statement, all variables and given/known data Combine the resistors into one single resistor 2. Relevant equations Resistors in parallel = 1/1/R1 + 1/R2 +1/R3.... Resistors in series = add 3. The attempt at a solution I have two ways of getting the resistance. One is by saying that the 80ohm is parallel 20ohm and then adding the 16ohm which gives me 32ohm(which is the correct given answer) (1/1/80 + 1/20)+16 = 32ohm (correct) Another way I thought of is to say that the 16ohm and 80ohm are in parallel and then adding the 20ohm which gives me 33.3ohms which isn't correct. (1/1/80 +1/16)+20 = 33.3ohm (not correct) What I don't understand is how is the second method not giving me the same answer?