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Random Puzzles


Difficulty: HardPuzzle 1

You have 12 coins, one of which is fake. The fake coin is indistinguishable from the rest except that it is either heavier or lighter, but you don't know which. Can you determine which is the fake coin and whether it is lighter or heavier using a balance scale and only 3 weighings?

Puzzle Image

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[Ref: ZLKY]  


Difficulty: EasyPuzzle 2

Puzzle IconIf Fred the Squirrel can find one nut in 15 minutes and Jane the Squirrel can find one nut in 12 minutes.

How many whole nuts will they accumulate in a day if they work together.

Bearing in mind their daughter, Teresa, takes 20 minutes to eat a nut and she eats all day long!

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[Ref: ZENX] © Kevin Stone 


Difficulty: EasyPuzzle 3

Puzzle IconIn the olden days, a man rode into town on his horse.

He arrived on Monday, spent six days in town and left on Friday.

How is that possible?

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[Ref: ZROP]  


Difficulty: MediumPuzzle 4

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?

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[Ref: ZTFU] Copyrighted 

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