1. 1st divide to half take the heavier out公仔箱論壇( K( w6 a5 N9 J. X( M+ q
2. 2nd take 4 balls out of 5 divide 2 groups to get the heavier out. (if is equal thn the remain is the one u looking for) - u) s1 `) |) [) L/ b1 ?/ S5.39.217.763. Same method if is not equal on 2nd try.