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balancing weights


Best Answer Rainman, 25 February 2014 - 06:07 AM

Spoiler for

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#1 BMAD

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Posted 24 February 2014 - 11:46 PM

You have an unlimited supply of 7 and 11 pound weights. You also have a 5 pound potato. Can you weigh the potato on a balance scale? What about a 9 pound potato?
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#2 Rainman

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Posted 25 February 2014 - 06:07 AM   Best Answer

Spoiler for


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#3 plasmid

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Posted 25 February 2014 - 07:25 AM

Spoiler for an approach with minimal math
But this is not the approach with the minimum number of weights, in case anyone wants to go after that problem.
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