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Difficulty: EasyPuzzle 401

What is represented by this BrainBat?

GLOOOOKD

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[Ref: ZHRO]  


Difficulty: EasyPuzzle 402

  • Place letters into the grid such that every row, column, and 2x2 block has letters (in any order) that form a common word.
  • Each letter is only used once, and no letter is repeated in the rows/cols/blocks.
  • Letters allowed: C O L U M B U S.

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[Ref: ZWPU] © Alan Stillson and Frank Longo. 


Difficulty: MediumPuzzle 403

I have a machine which has four sequential cog wheels in constant mesh.

The largest cog has 168 teeth and the others have 49, 32 and 15 respectively.

How many revolutions must the largest cog make before each of the cogs is back in its starting position?

Cog Puzzle

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[Ref: ZTFU] Copyrighted 


Difficulty: EasyPuzzle 404

Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?

?

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[Ref: ZWYX] © Kevin Stone 

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