Jar with the heaviest pill
You have 5 jars of pills. Each pill weighs 10 gram, except for contaminated pills contained in one jar, where each pill weighs 9 gm. Given a scale, how could you tell which jar had the contaminated pills in just one measurement?
posted by Foobar @ 6:38 PM
1 Comments:
Place 10,9,8,7,6 pills of each container on the scale. If all were 10gm, the total should be
10*10 =100
10*9 = 90
10*8 = 80
10*7 = 70
10*6 = 60
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400
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If Jar B was bad, then its total wud be 81.
Similarly,
C 72
D 63
E 54
So depending on the total's last digit, you can make out the bad jar.
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