Vr1=?

R2=?
Vr3=2.21V
I=12.3 mA
R3=?
find Vr1,R2 and R3.

Vr1 = 2.21V

R2 = (2.21V / 12.3mA) = 179.3Ω
R3 = (2.21V / 12.3mA) = 179.3Ω