Puzzle 89
Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?
| + | 4 | – | 1 | + | 3 |
| 2 | + | 4 | – | 1 | + |
| – | 3 | + | 2 | – | 2 |
| 2 | – | 4 | + | 3 | – |
| + | 3 | – | 1 | + | 2 |
| 6 | + | 1 | – | 2 | + |
Note: this puzzle is not interactive, and the squares cannot be clicked.
Puzzle Copyright © Kevin Stone
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Puzzle 90
A woman had three old coins: a silver dollar, a quarter, and a dime. Each coin was a little battered and had a piece missing. She found that exactly the same fraction had broken away from each coin.
What fraction of each was missing if the value of the remaining bits of coins was now exactly one dollar in total?
For this puzzle it can be assumed that 1/2 a coin is worth 1/2 of its value.
Based on a puzzle by Henry Ernest Dudeney.
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Puzzle 91
Painter Pete did such a good job of the housing estate, he was asked to paint the room numbers on all of the doors of the fourth floor of the local hotel.
Pete painted all of the numbers from 400 to 499.
How many times did he paint the number 4?
Puzzle Copyright © Kevin Stone
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Puzzle 92
How many squares, of any size, can be found on a standard chessboard?
How many rectangles, of any size, can be found on a standard chessboard?
Remember when counting the rectangles, that squares are also rectangles.
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