What is the value of the letters A and B in the figure down below? The square and the circle are independent from one another, i.e. they are solved independently.
Here follows my train of thought:
For the square I first noticed that the middle row sums to 30 and that the main diagonal also sums to 30. Then I began filling in the empty squares such that each row, column and diagonal sums to 30, but doing this I end up with that A can be any value between 0 and 12.
For the circle I noticed that the sum of each piece is 1 greater or smaller than the piece straight opposite to it. This left me with B being either 6 or 8.
I think that when you have found the right solution it should be no uncertainty to what the correct value is. This is why I think that my solution is wrong.
Edit: The puzzle is from here. It's a geocache myst. In this myst you solve several logic puzzels that in the end give you the coordinates to where the cache is hidden. I have solved all the logic puzzels except the two that I have posted here.