For maximum power transfer,
The Attempt at a Solution
I know the efficiency is 50% during maximum power transfer. So when all the sources are acting simultaneously and ( at the same time) R=Rth, maximum power will be dissipated in R.
I am not sure how to use the given values of power since both R and the source voltages are unknown. Plus, the voltage sources are connected across three different ports. This problem is from Circuit Theorems chapter, so I guess I need to use Maximum power transfer theorem along with Superposition theorem.
Any guidance is appreciated.