^true.
43. Although highly unreasonable, you have to add up a specific corner of every circle (add up all the top rights, top lefts etc.). The answer of this is then mirrored in the middle circle. I find 15 by adding up corners of every circle which is then mirrored. Example: TL (top left) of all circles = BR (bottom right) (add up all the TL of every circle (3+4+7+1 = 15 = x)). So TR (top right) = BL (bottom left) = 5+8+3+4 = 20 (which is true).