I=I1=U1/R1=40/2=20 A
I3=U3/R3=48/3=16A
I2=I-I3=20-16=4A
R2=U2/I2=48/4= 12 Ом
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I=I1=U1/R1=40/2=20 A
I3=U3/R3=48/3=16A
I2=I-I3=20-16=4A
R2=U2/I2=48/4= 12 Ом