1st trial - put 6 balls at each side .. take out the lighter 6 balls公仔箱論壇, L' w( C& [4 h. U
2nd trial - put the heavier 6 balls by 3 balls at each side) w* o8 I& \9 k& S- ~/ d4 G/ Q
lastly, take out the lighter 3 balls.... now left 3 balls..tvb now,tvbnow,bttvb0 g: Z0 @1 c4 x3 J0 w- M6 I
3rd trial - put 1 ball on each side, left 1 ball on table. if both sides balance, the ball on table is the heaviest. if one side on the scale is heavier then it is the heaviest... |