1. 1st divide to half take the heavier out % Y+ V8 X2 M6 k- x3 ]5.39.217.762. 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) ) I# `6 _9 r- s2 H; _7 @. U公仔箱論壇3. Same method if is not equal on 2nd try.