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Cutting A Wood Block
Answer :

Though the cubic contents are sufficient for twenty-five pieces, only twenty-four can actually be cut from the block. 

First reduce the length of the block by half an inch. 

The smaller piece cut off constitutes the portion that cannot be used. 

Cut the larger piece into three slabs, each one and a quarter inch thick, and it will be found that eight blocks may easily be cut out of each slab without any further waste.

Medieval Brain Teasers