A Kirchhoff Voltage and Current Law problem.

Find the voltage across the 40 ohm resistor.

Following values are to be used: $$R_1=10 \Omega, R_2=20 \Omega, R_3 = 40 \Omega, V_1 = 10 V,V_2 = 20V$$.

Answer is to be given in volts.

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