1. 1st divide to half take the heavier out公仔箱論壇 O6 j" H3 B7 r' ]; ]$ s
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) 2 q5 m3 g2 T: I L& ]" \" f, l3. Same method if is not equal on 2nd try.