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Puzzle 17 


What number comes next in this sequence:

2 · 5 · 9 · 19 · 37 · ?

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Puzzle 18 


Bog Snorkellingall logic puzzles

Four friends were competing in the internationally renowned BrainBashers Bog Snorkelling competition.

As usual, the judges were a little careless and, once again, they managed to lose the results.

Luckily, a number of spectators were able to remember the following snippets of information:

Only one person wore the same number as the position they finished.
Gary, who didn't wear green, beat Barry.
Larry beat the person who wore yellow.
The person who wore number 3, wore green.
The person who wore number 2 finished first, whereas Harry came last.
The person who finished second wore green, Barry wore yellow, and the person wearing red beat the person wearing blue.
Can you work out who finished where, and the number and colour they wore?

Puzzle Copyright © Kevin Stone

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Puzzle 19 


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 20 


Which letter is missing from this sequence:

b · c · e · g · k · q · s · w

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