Question

Find the equivalent resistance of the circuit.
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Answer 1

22.725

Step-by-step explanation:

Working our way from right to left, 20 ohm + 1/(1/15+1/15) ohm + 20 ohm
= (40 + 15/2) ohm
= 95/2 ohm

Now, to the middle, 10 ohm + 1/(1/20+1/15) + 15 ohm
= (35 + 60/7) ohm
= 305/7 ohm

Finally, summing up the equivalent resistances along the wires connected in parallel;

1/(2/95+7/305) ohm,
which is approximately 22.725 ohm