who can't figure out??????it's just basic math, primary school kid should already know it [-X1 e7 ~2 H; T7 b$ H% B* A  _9 e 
5.39.217.77:88980 H1 l  C/ m/ K' x7 ^; d 
1st: 6 vs 6, find out which side is heavier 
7 G1 Q1 o* P" Z$ vtvb now,tvbnow,bttvb2nd: from the heavy side, 3 vs 3,  find out which side is heavier 
9 B6 Y% y- n5 D8 x  C7 D5.39.217.77:88983rd: choose 2 out of 3 from the heavier side, if they weight the same, the 1 left is the one, if not, u can see it right away the heavier ball is on the 天秤 |