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Puzzle 13 


What comes next in this sequence:

eno  owt  ehret  rouf  eivf  xis  ?

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Puzzle 14 


As the auditor for my local theme park, I noticed that on Saturday there were 4,296 children and 2,143 adults and the takings were £98,718.

However, on Sunday, there were 5,146 children and 2,807 adults and the takings were £122,570.

How much were the children's tickets and adult's tickets?

Puzzle Copyright © Kevin Stone

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Puzzle 15 


Your objective is to place some diagonal mirrors into the grid.

If a ray of light is shone in to the grid from each of the letters, and allowed to bounce off the internal diagonal mirrors, each will exit the grid at the twin of the letter that it entered the grid. For example, a ray entering at either letter D will bounce off some mirrors and exit the grid at the other letter D.

Each row and each column will contain exactly two of the diagonal mirrors.

Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (196.26) and is used with permission.

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Puzzle 16 


Imagine a chessboard of size 20 x 20 instead of the normal 8 x 8.

How many squares, of any size, are there in total?

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