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Mathematical Puzzles


Difficulty: MediumPuzzle 17

Puzzle IconWhat is the sum of...

...all of the numbers from 1 to 1000?

[Ref: ZONR]

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Difficulty: EasyPuzzle 18

Puzzle IconWhich of these is correct:

Six and six IS eleven or six and six ARE eleven?

[Ref: ZYTW]

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Difficulty: MediumPuzzle 19

In the following sum the digits 0 to 9 have all been used, O = Odd, E = Even, zero is even and the top row's digits add to 9. Can you determine each digit?

Puzzle Image

[Ref: ZVZB] © Kevin Stone

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Difficulty: MediumPuzzle 20

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

The largest cog has 63 teeth and the others have 42, 35 and 27 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: ZTLC] Copyrighted

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