You have a set of four coloured cardboard discs in front of you. All you know about them is that each disc is either black or white on one side, and either yellow or blue on the other.
When you come to think about it, you have the feeling that every disc that is white on one side is blue on the other. Which discs do you need to turn over to check this?
Jack is twice as old as Eileen. Two years ago, Eileen was a third of Richard’s age, and Richard was two years younger than Betty. In four years’ time, Betty will be one and a quarter times the age of Jack. How old are they at the moment?
Move two matches to leave four squares.
Starting with the same pattern, move six matches to make 17 squares.
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