Question

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Answer 1

I believe it's 10V. But it's more of a guesstimate. I did, (1.75*25)-(2.25*15)=10.
Basically, you have to figure out how the Current will split.
There is a high chance i am wrong so make sure you learn how to split the current.
The rule is that High Resistance = Low current. And vice versa. That is why I Chose 2.25 for the top and 1.75 for the bottom

Answer 2

I was correct in the concept, just not in the numbers :P