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clear//
//Variables
Vs = 100 //Source Voltage (in volts)
I = 5 //Current entering the circuit (in Ampere)
IL = 5 //Current leaving the circuit (in Ampere)
R15 = 15 //Resistor of 15 ohm (in ohm)
V15 = 30 //Voltage across 15 ohm resistor (in ohm)
//Calculation
I1 = V15 / R15 //Current through 15 ohm resistor (in Ampere)
IA = I + I1 //Current entering junction A (in Ampere)
//Applying Kirchoff's current law
I2 = I + I1 //Current through 5 ohm resistor (in Ampere)
IB = I2 //Current entering juction B (in Ampere)
IR = IA - IL //Current through R (in Ampere)
//Applying Kirchoff's voltage law
//(7 * 5) + (2 *R) - 100 + 30 =0
R = 35.0/2
//Result
printf("\n The value of R is %0.3f ohm.",R)
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