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Mathematical Puzzles


Difficulty: EasyPuzzle 1

Puzzle IconCan you Find a number...

...whose double exceeds its quarter by 7.

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[Ref: ZHRW] © Kevin Stone 


Difficulty: EasyPuzzle 2

Puzzle IconLast week, I travelled from Birmingham to Glasgow (via bicycle).

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

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

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

Yesterday I travelled one third of the remaining distance.

I now have 21 miles left to travel.

How far is it from Birmingham to Glasgow in total?

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[Ref: ZZVA] © Kevin Stone 


Difficulty: EasyPuzzle 3

Puzzle IconWhat is the 5-digit number in which:

the sum of the first two digits is one smaller than the third digit
the third digit is double the fourth digit
the fourth digit is double the last digit
the third digit is the product of the fourth and fifth digits
the second digit is five more than the first digit
the first digit is one-eighth the third digit and also one-fourth of the fourth digit?

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[Ref: ZBUX]  


Difficulty: MediumPuzzle 4

Here is a curious grid, the sums of the shapes are shown at the end the row and at the base of each column.

What is the missing sum? What are the different shapes worth?

Puzzle Grid

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[Ref: ZJFC] © Kevin Stone 

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[Added September 1997]

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