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There are three sources of resistance in a parallel circuit. Two of them are rated at 20 ohms, the other at 10 ohms. What is the circuits total resistance?

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    I assume all three are in parallel
    first combine the two 20 ohms
    1/R = 1/20 + 1/20 = 1/10
    Req = 10
    now combine that 10 with the other 10
    1/R = 1/10+1/10 = 2/10 = 1/5
    so R = 5 Ohms in the end

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