Parallel circuit with three resistors: find the unknown resistance

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A circuit diagram of a 12 V battery with an ammeter reading 6 A, and three resistors in parallel: R_1 4 Ω, R_2 6 Ω and R_3 x — A 12 V battery and an ammeter reading 6 A in the main line, with three resistors in parallel: R_1 of 4 Ω, R_2 of 6 Ω and R_3, whose resistance is the unknown x for students to find. The battery’s + and − terminals are marked.

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