Measure the heavier one.
Logic
Level
2
You have 9 balls all with the same dimensions and the same weight except for 1 which is a bit heavier than the others. You are provided with a beam balance, what is the least no. of times you need to weigh to find out the heavier ball?
The answer is 2.
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1 solution
Make 3 groups of 3 balls each and weigh 2 of them once. The one that weighs more is likely to have the heavier ball. Now weigh 2 balls from the heavier bundle if they same the 3rd one is the heavier ball. If the 2 groups weigh same, weigh any 2 balls from the 3rd group if the 2 balls weigh same then the 3rd ball is the heavier one.