Update: The problem as stated is correct. We have removed erroneous solutions.
First I do not intend to offend or criticise any individuals here. Everyone makes mistakes; I certainly do make a lot of them. Having said that; I am somewhat surprised and disillusioned by the total acceptance by brilliant.org and the 591 solvers of the problem Va is the same at all branch.
This question clearly poses and impossible scenario that could never possibly happen. Current, voltage and resistance values within any circuit are always related by the relationship I=V/R. We cannot arbitrarily assign values to each these (I,R,V) and then actually make a circuit that fulfills all the criteria as given. We can only assign a value to any two of the criteria and the third value will be dictated and can be calculated.
In the problem it appears that the given values for the resistors the battery voltage and the current at the meter where each set independent to the others producing a nonsense scenario.
If that kind of problem is considered valid then how about a question like this one?
A train moving at a fixed speed of 1 mile per hour, travel between two points on a track that are 1 mile apart, and the trip take 3.5 hrs what is the time at the half way point? Clearly this question is not valid, it cannot happen, something must be changed to make sense of it. There are no meaningful answers to either of these questions. Each individual solver will have to ignore or alter some bit of the information given to make any sense of the scenario.
For me the nonsense problem is of little interest it is just a mistake. The fact that 593 solvers tried the problem, 32% of the solvers arrived at the same answer and 11 posted solutions is very interesting. How is this possible? How can so many people attempt a problem like this and not see that it is not valid?
A couple of days ago, I posted a dispute where I pointing out that this problem is not valid. I have seen no reply or explanation from brilliant.org or anyone else. I find it disappointing. Is this possibly an indication of the general validity and quality of the sites problems and answers?
I would be interested in comments as to how this question has survived this long. What are the solvers thinking? Perhaps the reality was they where not doing much thinking at all. Does anyone care?