take 4 balls as a group, 3 groups - A B C
5 B8 c& ?7 P8 U5 L1 D p- w( x5.39.217.77:8898weigh A & B (ex. B heavier)公仔箱論壇2 U1 h% m( h' G7 A
then weigh B & C (B & C same weight)
7 n+ s+ |; R0 i# |' J$ }( Oto find which group has the weight difference and find out is it (A is lighter)8 n: K& }4 S& d+ m5 n+ e
heavier or lighter5.39.217.77:88980 k9 V; Q. j4 |' y8 R6 t( t) C
then measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)8 S* h% ]* G" z! |/ @0 m3 I
measure E vs F to find which 1 is lighter.... |