The minimum number of weighings in two. In the first one, three balls are put on both sides of the balancing scale. If one side is heavier, two of the three balls are weight (one one each side). If none of these balls is heavier the ball of the three that was not weight is the heavier one. If in the first weigh both sides have equal weight the two remaining balls are weight and the heavier one is found.

The minimum number of weighings in two. In the first one, three balls are put on both sides of the balancing scale. If one side is heavier, two of the three balls are weight (one one each side). If none of these balls is heavier the ball of the three that was not weight is the heavier one. If in the first weigh both sides have equal weight the two remaining balls are weight and the heavier one is found.