I have two identical bar magnets... Each bar magnet can lift an object with 10lb of force.
When they attract each other, I believe that each magnet applies a force of 10lb to attract the other. That means the point where they are attracted say x (-)x(+) Where - is mag 1 and + is mag 2. (And x is no gap just a spot to target, so the real thing is (-)(+)) The force of attraction that is x is 10x2 = 20lb since BOTH magnets are attracting each other? Knowing that the distance between each magnet is 0 cm. And + since it takes 20lb to split them apart to... I guess yes?
Since each manget! Can attract objects with 10lb of force. And repel another magnet with 10lb, its fair to say that attraction force is 20lb.