I need help with these electice circuts questionsSolution50

I need help with these electice circuts questions

5.0) Req=(7+8)10/(15+10)+(20*5)/(20+5)=10 ohms

IT=50/ Req=50/10=5 AMPS

I=(5*15)/(15+10)=3 AMPS

VOLTAGE ACROSS 8 OHMS=2*8=16 VOLTS.

4.0) Req=(1.8*2.7)/(1.8+2.7)=1.08 kohms

It=54/1.08k=50 mamps

i1=(50*10^-3*2.7*10^3)/(1.8*10^3+2.7*10^3)=30 mamps

i2=it-i1=50-30=20 mamps.