Hi Fiz
Bear in mind I had to do this sort of stuff 30 odd years ago, so I may be a little off, (those better educated, feel free to point out the errors)
If this was a single cap then V=IR where V=25, I=0.23
so R= 108.7, simple enough
I think that now you have a resistance that you can use this as the reactance of the cap? So using:
Xc = 1 / 2*PI*f*C
where Xc = 108.7
Pi = 3.14
f = 580
C = ?
so
C = 1 / 2*3.14*580*108.7
C = 2.52uF
However I don't think that this is the answer as you already have a capacitor in circuit.
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