jexmand

1st trial - put 6 balls at each side .. take out the lighter 6 balls
9 l0 D) T8 y5 F# v+ S2 \+ O+ `2nd trial - put the heavier 6 balls by 3 balls at each side6 h4 t8 z& }8 r
lastly, take out the lighter 3 balls.... now left 3 balls..
# ]  Q2 j  f) V! C! P/ q' D+ R8 x; P3rd 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...