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22 replies to this topic

#1 Ben Law

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Posted 03 July 2008 - 09:56 PM

You have 10 packets of cigarettes and each packet contain 10 cigarettes. We assume that the packets are weightless and that each cigarette weigh 10 grams. There is a packet within the lot where each cigarette weights 1 gram less i.e. 9 grams. What is the minimum times you must weigh to find out which packet is the one with the lesser weight cigarettes ???
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#2 Jahudo

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Posted 03 July 2008 - 10:04 PM

Spoiler for answer

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#3 Jarod997

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Posted 03 July 2008 - 10:20 PM

Spoiler for First Guess

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#4 firebirdaz

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Posted 03 July 2008 - 10:30 PM

Spoiler for guess

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#5 Ben Law

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Posted 03 July 2008 - 10:46 PM

Spoiler for answer


One packet had each cigareete weighing 9 grams each, so that pack weighed 9x10 = 90 grams instead of 100 grams
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#6 sterlingmusk

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Posted 03 July 2008 - 10:53 PM

Spoiler for i got it..

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#7 wh1zurd

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Posted 03 July 2008 - 11:05 PM

You have 10 packets of cigarettes and each packet contain 10 cigarettes. We assume that the packets are weightless and that each cigarette weigh 10 grams. There is a packet within the lot where each cigarette weights 1 gram less i.e. 9 grams. What is the minimum times you must weigh to find out which packet is the one with the lesser weight cigarettes ???


You need to weigh 4 or 6 times.
First 5 vs. 5 (2 times)
Lightest of this goes on
2 vs. 2 with one not being weighed (2 times)

If these are the same weight, you know that the packet that wasnt weighed is the lightest. If not, weigh the two packets and find which is the lightest (2 times)
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#8 ccgolfballs

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Posted 03 July 2008 - 11:15 PM

Spoiler for Answer
I got it :D :D
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#9 initialj

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Posted 03 July 2008 - 11:19 PM

Spoiler for a diff answer

Edited by initialj, 03 July 2008 - 11:22 PM.

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#10 akaslickster

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Posted 03 July 2008 - 11:20 PM

Spoiler for umb,

You have 10 packets of cigarettes and each packet contain 10 cigarettes. We assume that the packets are weightless and that each cigarette weigh 10 grams. There is a packet within the lot where each cigarette weights 1 gram less i.e. 9 grams. What is the minimum times you must weigh to find out which packet is the one with the lesser weight cigarettes ???


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