explain illusion please, my mum is stuck in a loop.
closed account (3qX21hU5)
It seems to be a reverse of the "Missing square puzzle" http://en.wikipedia.org/wiki/Missing_square_puzzle
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After doing some simple geometry the proof is as follows:
The final block is actually a 4*5.75 block piece of chocolate. The cutting and swapping remove 0.25 from the top each column, and since there are 4 columns and 0.25*4=1 there is 1 piece of chocolate left over.
The final block is actually a 4*5.75 block piece of chocolate. The cutting and swapping remove 0.25 from the top each column, and since there are 4 columns and 0.25*4=1 there is 1 piece of chocolate left over.
Ah good, she was very upset, chocolate has to be dependable and simple in the matriarchy that is my family, we can not have it breaking the laws of physics.
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