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How to answer this question

How to answer this question

by jye leckner -
Number of replies: 0

Series and Parallel 

R1 = ? 

R2 =30 ohms 

R3 = 30 ohms 

R4 = 40 ohms 

VT = 120v 

V3 over r2 and r3 = 20v 

Finding R1