Three resistances, R = 60 Ω, R2 = 30 Ω, and R3 = 20 Ω, are connected in series.
(a) What is the total equivalent resistance of the arrangement?
(b) If this series arrangement is connected in parallel to a 50-Ω resistance and the total combination is connected to a 12-V source, how much current is drawn from the source?