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Knowledge You Can Build On — Est. 1998

Weight Guessing Puzzle

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Weight Guessing Puzzle

#1

Peter Martin

Weight Guessing Puzzle

Two boards are identical species and length, but one is 20% wider and 20% thicker.
How much heavier is it?

Re: Weight Guessing Puzzle

Solution #2

44%

Re: Weight Guessing Puzzle

#3

Peter Martin

@Dale Stansbery,

Correct! 

Common mistake: people add 20% + 20% = 40%, but percent changes multiply when they apply to different dimensions.

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