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Mathematical Puzzles


Difficulty: EasyPuzzle 45

Some months have 30 days, some have 31, but how many have 28 days?

[Ref: ZJCL]

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Difficulty: EasyPuzzle 46

Puzzle IconMy BrainBashers electronic world atlas has developed a fault, I did a listing of miles from England to particular countries and here is the result:

America      1,800 miles
New Zealand  2,400 miles
Japan        1,200 miles
Brazil       1,400 miles

How far away did it list Argentina as?

[Ref: ZEXF] © Kevin Stone

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Difficulty: MediumPuzzle 47

Puzzle IconCan you find a five digit number which has no zeros nor ones in it and no digit is repeated, where:

The fourth digit is a quarter of the total of all of the digits.
The second digit is twice the first digit.
The third digit is the largest.
The last digit is the sum of the first two digits.

[Ref: ZPXQ] © Kevin Stone

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Difficulty: EasyPuzzle 48

Puzzle IconAlan's son Daniel, is exactly one fifth of Alan's age.

In 21 years time, Alan will be exactly twice Daniel's age.

Betty's is exactly seven times the age of her daughter, Jessica.

In 8 years time, Betty will be three times the age of Jessica.

How old are Daniel and Jessica now?

[Ref: ZQZZ] © Kevin Stone

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