Question

Answer This................

Answer 1

Answer:

3. 120 ohm

Explanation:

Taking left parallel arrangement,

R1 = 30×60/(30+60) = 1800/90 = 20

Now , since total is 50 ohm then R2 should be equal to (50-20)=30 ohm

30 = 40 × X/(40+X)

120 + 3X = 4X

X = 120 ohm