Puzzle 5
The river Pregel ran through the town of Konigsberg. In the river were two islands, connected to each other and the rest of the city by seven bridges.
The residents of Konigsberg challenged each other to walk through the city, and cross each of the seven bridges exactly once.
Can you find a path that they might have taken?
This is the 'Seven Bridges of Konigsberg' puzzle, tackled by Leonhard Euler in 1736.
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Puzzle 6
Hidden in the grid below are eight, 7-letter words. Each word begins with the central R and you can move one letter in any direction to the next letter. All of the letters are used exactly once each. What are the words?
| T | A | E | R | O | B | O |
| E | T | G | S | T | N | W |
| R | N | E | E | A | I | E |
| I | N | U | R | E | F | R |
| N | B | U | O | E | E | E |
| B | S | E | A | E | V | E |
| I | D | H | T | S | G | N |
Note: this puzzle is not interactive, and the letters cannot be clicked.
Puzzle Copyright © Kevin Stone
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Puzzle 7
How many cubic feet of earth are removed …
… to make a hole 4 feet wide by 7 feet long by 2 feet deep?
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Puzzle 8
I recently went to the shop and purchased 4 items.
Three of the items cost:
$1.50
$3.00
$4.00
There was quite a long queue, and as I was quite bored, I was playing with my pocket calculator while I waited.
Very curiously, the 4 prices added to the same number as I got when I multiplied the 4 prices together.
What was the price of the 4th item?
Puzzle Copyright © Kevin Stone
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