anakmalas

this is too easy!!公仔箱論壇4 r- m0 P1 B" J8 W* G: E5 V3 b

& c) Q7 @/ \; [( Z& ~1. put 6 at each side.. take the one side which is heavier
" K2 F  O8 o: Y, {* i$ Z  t2. put 3 at each side.. also take the heavier side
, _( a% I) `# k/ H3. put 1 at each side.. if the weight balance then the one not put inside is the heavy ball.. else the side which is heavier is the heavier ball..