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Random Puzzles


Difficulty: MediumPuzzle 1

Last week, I travelled from London to Stoke.

On the first day I travelled one half of the distance.

On day two, I travelled one third of the remaining distance.

On day three, I travelled three quarters of the remaining distance.

Yesterday I travelled one half of the remaining distance.

I now have 5 miles left to travel.

How far is it from Stoke to London in total?

Puzzle Image

[Ref: ZRBH] © Kevin Stone

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Difficulty: EasyPuzzle 2

What is represented by this BrainBat?

Puzzle Image

[Ref: ZHQZ]

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Difficulty: MediumPuzzle 3

Puzzle IconWhat comes next in this sequence:

Iron Bromine Uranium Argon ==?==

[Ref: ZQPU] © Kevin Stone

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Difficulty: MediumPuzzle 4

Puzzle IconMr Smith has lots of pound coins, ten boxes in all. Each box contains 100 pound coins, but one box contains coins which are all counterfeit and are slightly lighter, 1/16 of an ounce lighter to be exact.

The problem lies in the fact that they all look identical, the only way to tell them apart is to weigh them.

Mr Smith knows the correct weight for a box, but how many weighings are required to determine which box contains the counterfeit ones?

[Ref: ZJYH]

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