Find the unknown resistance value in given circuit.

(a) 10.2Ω

(b) 11.7Ω

(c) 10.5Ω

(d) 11.5Ω

This question was posed to me in class test.

I would like to ask this question from Measuring Resistance the Wheatstone Bridge and Delta-to-Wye (Pi-to-Tee) Equivalent Circuits in section Simple Resistive Circuits of Electric Circuits

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