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Difficulty: EasyPuzzle 1209

Puzzle IconI have a drawer full of socks.

There are 5 socks of each colour, red and green, evenly mixed. In the morning, when it is very dark, I need to pull out a pair of socks of the same colour.

How many must I pull out of the drawer to ensure that I have at least one pair of matching socks?

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[Ref: ZVFI]  


Difficulty: EasyPuzzle 1210

Which is larger, 3 raised to the 5th power, 5 raised to the third power?

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[Ref: ZBSB] © Kevin Stone 


Difficulty: MediumPuzzle 1211

A bookworm eats from the first page of an encyclopaedia to the last page.

The bookworm eats in a straight line.

The encyclopaedia consists of ten 1000-page volumes and is sitting on a bookshelf in the usual order.
Not counting covers, title pages, etc., how many pages does the bookworm eat through?

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[Ref: ZPZW]  


Difficulty: EasyPuzzle 1212

If I can boil 2 eggs in 10 minutes.

How long will it take me to boil 5 eggs?

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[Ref: ZJQX]  

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