Finding missing resistances and voltages in series-parallel circuit

[pebbles3]

Homework Statement

I'm supposed to find the missing resistances, currents, and voltages from the first picture (attached)

Homework Equations

v = IR
R = V/I
I=V/R

The Attempt at a Solution

My attempt is in the second attached picture. I'm completely lost on what to do for R3. Would R3 and R4 have the same voltage? I'd really appreciate some help with this.

 

[pebbles3]

Anyone?

 

[gneill]

R3+R4 is in parallel with R2. What does that tell you about the total voltage across R3+R4?

 

[pebbles3]

The voltages are the same in parallel, right? So.. would the total voltage across R3+R4 equal 1.2 V?

 

[gneill]

The voltages are the same in parallel, right? So.. would the total voltage across R3+R4 equal 1.2 V?

Yes, of course.