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Difficulty: MediumPuzzle 453

A rope swing hangs vertically down so that the end is 12 inches from the ground, and 48 inches from the tree.

If the swing is pulled across so that it touches the tree, it is 20 inches from the ground.

How long is the rope?

Puzzle Image

[Ref: ZYJB] © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (198.24) and is used with permission.

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Difficulty: EasyPuzzle 454

Puzzle IconCan you tell what this rebus is?

GLOOOOKD

[Ref: ZHRO]

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Difficulty: EasyPuzzle 455

  • 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.

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

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Difficulty: MediumPuzzle 456

Puzzle IconThe BrainBashers mechanical computer is a very sensitive device, it consists of interlocked toothed gear cogs.

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

By accident, Daniel started to rotate the largest cog.

How many revolutions must he rotate the largest cog make before the computer is back in its starting position with all of the cogs where they started?

[Ref: ZTFU] Copyrighted

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