i thing the answer is
' B2 F. }) M7 t& b" ostart with 4 on each side of the scale,this will have two possible outcome, same or diff.5.39.217.77& ^, g7 N% o k! P
If the same then 4 that left over contain the odd ball. put 1 of the 4 to each side, two outcome, same or different again. Replace 1 from the remaining, if the same then left over is the odd or if different the replacement is the odd one. I didn't time myself but I think I take less than 30 minutes. There are two more possible out come but still need three weighing but I think I am running out of space. |