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Puzzle 17 


Starting with any number on the top row, make your way to the bottom, adding the numbers as you go.

Each time you must move to the next row, but you can move either straight down, or one place to the left or right.

What is the highest total you can make? What is the lowest?

Note: this puzzle is not interactive, and the numbers cannot be clicked.

Puzzle Copyright © Kevin Stone

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Puzzle 18 


What is the smallest positive integer which …

… when multiplied by 3 gives a number consisting of only 4's?

Puzzle Copyright © Kevin Stone

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Puzzle 19 


In each of these sentences, can you replace the missing number.

The number is written as a word (e.g. five, twenty-four, thirty-three), and each sentence is correct after the replacement.

This sentence contains exactly ? E's and not one more.
However, this sentence contains exactly ? S's, with a single Z.
Finally, to finish, this sentence has exactly ? I's.

Puzzle Copyright © Kevin Stone

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Puzzle 20 


What number comes next in this sequence:

2 · 5 · 9 · 19 · 37 · ?

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