Puzzle 45
Can you find a five-digit number that has no zeros, and no repeated digits, where:
The first digit is a prime number.
The second digit is the fifth digit minus the first digit.
The third digit is twice the first digit.
The fourth digit is the third digit plus three.
The fifth digit is the difference between the first digit and the fourth digit.
Don't forget that 1 isn't prime, the prime numbers start with 2, 3, 5, …
Puzzle Copyright © Kevin Stone
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Puzzle 46
What number comes next in this sequence:
1 4 1 5 9 2 {?}
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Puzzle 47
Which of the shapes is identical to the first one?
There might be more than one.
Puzzle Copyright © Robert A. Hartmann
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Puzzle 48
Find two words, which are anagrams of each other, which complete this sentence:
Due to a recent outbreak of a {?} infection in the zebra house, the local animal sanctuary had to {?} their electron microscope correctly, to ensure rapid detection.
Puzzle Copyright © Kevin Stone
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