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huh?? How tough is it?tvb now,tvbnow,bttvb7 E3 ^2 N- r) {" d8 G/ _
1/. break it down to 2 section, 6 balls on each side. Put which every section shows lighter away公仔箱論壇! }# G4 x3 l, x8 N7 m3 }) }+ ]1 a  Y

; g' u/ t2 o2 ~0 o# r2/. Break the more heavy section in to 2 sections again, which is 3 balls on each side. Keep the more heavy side again.
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! |5 I) h4 @7 L$ Q3/. Pick 2 balls and put them on each side from the remaing 3 balls. If they are equal weight, the ball on the table is the more heavy one, if one side is more heavy than the other, that will be the more heavy one.
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Easy. Tough question? For whom? I did it in 1 minute.