Alpha-Delta!
posted by Caprico
- January 06 2012 05:28:50 AM
Okay guys, I found this one on another site, and its truly boggling... So here goes:
You manufacture brain wave entrainment CDs for companies that sell self-improvement products. You are at the post office, with ten boxes of them ready to close up and ship out, but you have a problem. Nine of the boxes contain CDs that are designed to put the listener into an "alpha" or relaxing state, and one is full of CDs that are designed to put the user into a deeper "delta" state, for deep sleep. They look identical, and you forgot to label them.
There is one difference, however. You remember that the "alpha" CDs weigh 13 grams, and because different CD blanks were used, the "delta" CDs weigh 15 grams. Unfortunately, you can't feel the difference in weight by lifting them.
The post office does have a scale. It costs one dollar each time you weigh something though, and you want to keep your costs down. How do you use the scale only ONCE to determine which are the "delta" CDs?
You manufacture brain wave entrainment CDs for companies that sell self-improvement products. You are at the post office, with ten boxes of them ready to close up and ship out, but you have a problem. Nine of the boxes contain CDs that are designed to put the listener into an "alpha" or relaxing state, and one is full of CDs that are designed to put the user into a deeper "delta" state, for deep sleep. They look identical, and you forgot to label them.
There is one difference, however. You remember that the "alpha" CDs weigh 13 grams, and because different CD blanks were used, the "delta" CDs weigh 15 grams. Unfortunately, you can't feel the difference in weight by lifting them.
The post office does have a scale. It costs one dollar each time you weigh something though, and you want to keep your costs down. How do you use the scale only ONCE to determine which are the "delta" CDs?
Reply by pinguhash
- January 09 2012 03:42:29 AM
Let's say how about putting one 1st CD on scale and telling the postmaster "I can't 2 CD's at a time it's heavy" and put 2nd CD on top of it and noting the weight and so on until you get a 15gm increase in the weight and you caught the theif!!!
Reply by Caprico
- January 09 2012 05:05:24 AM
I can't say its incorrect, but that would be unfair.. :P Think of a fair way to do it... I'll post the answer on the 16th, if no one guesses it by then..
Reply by pinguhash
- January 09 2012 07:23:17 AM
OK, let's say, taking 1 CD from 1st box, 2 CD's from 2nd box and so on... make a pile of them and weigh. Weight has to be a multiple of 13, and if it increases by 1 then 1st box is thief, if by 2 then 2nd box and so on... I think I am fair now...
Reply by Caprico
- January 10 2012 04:04:10 AM
:) Hehe.. Excellent.. You are correct... :) :D
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