Weigh your brain

Logic Level 2

You have 9 balls of exactly same appearance , and one physical balance. 8 of those balls have equal weight , and rest 1 is lighter than them. What is the minimum number of weighing that you should perform using those balls only and the balance so that you can (claim) identify the lightest ball.?


The answer is 2.

Chandrakant Pandey by Chandrakant Pandey , 28, India

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1 solution

divide the 9 balls in 3 triplets. STEP 1. weigh any two triplet balls on balance.now you are sure which triplet contains the lightest ball...as if what u weighted were equal then remaining one ..else lighter of the two triplet that you weighted have that ball. STEP 2. again weigh any two balls from that lightest triplet ....and logic the same way as step 1.

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I got this problem correct because it is always 1 of 2 answers when dealing with an odd # being measured. My issue with these types of problems is that it is totally subjective on the creator to determine "their" answer. Some would say 1 because you can weigh 4 v 4 and be evenly balanced meaning we already know that the odd one out if in fact the lighter. Others require a 2nd weighing to confirm that it is in fact lighter; even though you know it is. I find that so frustrating.

michael bye - 5 years, 9 months ago

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