Puzzle 81
How many squares of any size on this chessboard do not contain a rook?
Puzzle Copyright © Kevin Stone
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Puzzle 82
Recently Kevin had a party and because it was his birthday he wanted a mathematical cake!
He ordered a cake in the shape of a cube and had it completely iced (but of course they didn't ice the underneath because that just isn't very sensible).
He cut every side of the cake into three equal pieces, giving 27 slices of cake.
He ended up eating all of the pieces of cake that had exactly 2 sides with icing.
So, how many pieces did that leave for the guests?
Puzzle Copyright © Kevin Stone
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Puzzle 83
Starting in the bottom left corner and moving either up or right, adding up the numbers along the way, what is the largest sum that can be made?
| 2 | 3 | 5 | 4 | 1 |
| 3 | 2 | 4 | 3 | 4 |
| 5 | 1 | 3 | 5 | 2 |
| 3 | 3 | 2 | 3 | 1 |
| 1 | 4 | 2 | 4 | 4 |
Note: this puzzle is not interactive, and the numbers cannot be clicked.
Puzzle Copyright © Kevin Stone
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Puzzle 84
What is missing from this sequence:
teloiv ogidni eulb {?} wolley egnaro der
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