/sci/ - Science & Math

I have to review some basic electrical work hand outs from one of my previous classes. I don't work with electrical so this is pretty foreign to me. I'm trying to calculate the total resistance for a parallel circuit. The voltage is 120. The resistors are 58ohms in total. I calculate 120/58, which gives me 2.068ohms. My answer key and pic related say 2.20ohms. Where is the discrepancy and how do I arrive at the correct answer?