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**NEED HELP ASAP! Wheatstone bridge and DC series/parallel !! Please look!**

I have three problems I need help solving.

Problem #1:

Fine the value R1 in the figure if R2 = 30ohm, I = 0.5A and V = 10V

My try was:

Rp = R1 + R2 , 20 = R1 + 30 , R1 = -10?

** please look for attached diagram problem 1

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Problem # 2

You have a balanced wheatstone bridge at L2= 45cm, mark ( where L2 + L3 = 100cm ) and R1 = 100ohm, what is the unkown resistance Rx?

** please look at attached diagram for problem 2

Problem #3.

Calculate the current of A in the figure if R1 = 250ohms, R2 = 400ohms, R3 = 200ohms and R4 = 200ohms

** please look at problem 3 for the diagram attached.

I had I = V/R with 45V/450 Ohm which gave me 0.1 A I combined the resistors to 400, 400, 250 on the diagram.