jexmand

1st trial - put 6 balls at each side .. take out the lighter 6 balls公仔箱論壇# T% ?* U* S, Q& Z! e/ E  O6 D! T
2nd trial - put the heavier 6 balls by 3 balls at each side
! ~# M$ M& H' u1 B- V, ~lastly, take out the lighter 3 balls.... now left 3 balls..- r2 i- w* b8 f9 ]) s
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...