*r3= 9 ohms what is the voltage drop running through resistor five?

The correct answer is: The voltage drop across  is 45V.

Explanation:
First you need to find the total current of the circuit, which is:
According to Ohm's law:

V = I * R

I = V/R --- (1)

Where
R = Total Equivalent resistance of the circuit
V = Total Voltage = 90V
I -= Total Current

First let us find the equivalent resistance:


Now plug in the values in (1):
(1) => I = 90/30 = 3A

Now that we have current of the circuit, we can now find the voltage drop across   = 15 ohms using:


Where  is the voltage drop across resistor 5;

Try c ? that’s what i got

Centrapedial force is the answer