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Random Puzzles 


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Puzzle 1 


What 5-digit number am I thinking of?

It has two prime digits. Digit 3 is the highest digit. Digit 2 is the lowest digit. Digit 1 is higher than the sum of digits 4 and 5. Digit 5 is half of digit 4. Digit 1 is one smaller than digit 3. Digit 5 is between digit 2 and digit 1
The digit 0 doesn't appear, and there are no duplicates. Don't forget that 1 isn't prime, as the prime numbers start with 2, 3, 5, …

Puzzle Copyright © Kevin Stone

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Puzzle 2 


You have a barrel, filled to the top with water, which weighs 150 pounds.

What can you add to the barrel in order to make it lighter?

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Puzzle 3 


Which letter is missing from this sequence:

b · c · e · g · k · q · s · w

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Puzzle 4 


What is the smallest positive integer, which, when multiplied by 6 …

… gives a number consisting of only 8's?

Puzzle Copyright © Kevin Stone

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