The Puzzle: One of twelve balls is a bit lighter or heavier (you do not know) than the others.
At least how many times do you have to use an old balance-type pair of scales to identify this ball?
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ball puzzle
Replies (4)
"AT LEAST" Once
once
no its not ONE. All we know is that one of the ball weighs different, may be more or less than the others.
3 Times...
1) weight 6 ball by 6 ball will find 6 Ball which are bit lighter or heavier balls
2) weight 3 ball by 3 ball will find 3 Ball which are bit lighter or heavier balls
3) So Now we have 3 balls, So Weigth 2 balls of them so find bit lighter or heavier ball,if both are same then 3rd ball is lighter or heavier.
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