[Brain teaser] 6.1 Bottles of Pills - Shuatiblog.com
You have 20 bottles of pills. 19 bottles have 1.0 gram pills, but one has pills of weight 1.1 grams.
Given a scale, how to find the heavy bottle only scaling ONCE?
Solution
Take 1 pill from Bottle 1, 2 pills from Bottle 2, and so on. We'll expect (1 + 2 + … + 20) = 210 gram of pills.
The answer would be {(weight – 210 grams) / 0.1}.
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