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Mathematical Puzzles 


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Puzzle 129 


I recently gave a new watch to my friend for their birthday.

However, as usual with my presents, it was quite useless as it gains 6 minutes every hour.

I set it using my own accurate clock at midnight, and the watch now shows 8:26am.

I know that it stopped 30 minutes ago, so what is the correct time now?

Puzzle Copyright © Kevin Stone

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Puzzle 130 


Alex and Billie Stone have three daughters and each daughter has two brothers.

How many children do Alex and Billie Stone have?

Puzzle Copyright © Kevin Stone

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Puzzle 131 


Can you find a three-digit number such that when you reverse the numbers you get a larger number and the product of these two numbers is 224455?

Puzzle Copyright © Kevin Stone

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Puzzle 132 


I was recently given a new watch for my birthday.

However, as usual with my presents, it was quite useless as it loses 6 minutes every hour.

I set it using my friend's accurate watch at midnight, and it now shows 10:39am.

I know that the watch stopped 21 minutes ago, so what is the correct time now?

Puzzle Copyright © Kevin Stone

workings hint answer print