homework help (circuit problem)

Ok got some homework that im just totally stuck with and know one I know can help me :-(. Its for an electrical course, and I thought it was worth a try posting on AD. Ok if anyone is willing to help what I need to find out is:
Starting Volts
Missing Resistance:
Total Resistance: Can figure this one out myself but cant figure out the other resisters.

So far ive figured out that running though the first parallel circuit (R3) is 5amps, so there for adding on the existing 3.5amps in the total circuit is 8.5amps. That’s what I got but I could've fucked it up, ive tried figuring it out but keep running into the problem that in a parallel circuit they have the same voltage running through each. If anyone wants to give it ago, thanks