You have 300 balls. One ball weighs 11 grams and the other 299 weigh 10 grams each. Given a beam balance, what is the minimum number of weighings in which you can identify the heavier ball?
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Explanation:
Minimum would be 2 attempts....
So you have 100 balls and only 1 ball weighs different from the rest of the 99.
Split the 100 balls into two groups. One group with 49 balls and the other with 49 balls. Weight those two groups and we are assume that they will be balanced on a scale (also assuming you could use a scale too). This leaves 2 balls left that needs to be weighed and 1 out of those 2 balls is the heavier one .
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