# My friend and his granddaughter

There are numerous puzzles about ages, and most of them can be solved with elementary algebra, though the hassle of tracking forward and backward into time can sometimes be confusing.

2) My friend and his granddaughter*
A friend told me: 3 years ago, I was thrice as old as my granddaughter. 8 years before I that, that is, 8 years before I was three times as old, I was four times as old.
How old is my friend?

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# Pattern code square and circle

Four combinations of a square and a circle have been labelled with a three letter code. What code should the combination in the middle have?

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# Stefan de Banach

The Polish mathematician Stefan de Banach could have said: In the year x I was x^2 years old.

What is the next year in which a person can be born and later make this claim?

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# 10 glasses

There are 5 filled and five empty glasses in a row:

A) Can you move 4 glasses in such a way that full and empty glasses alternate?
B) Can you move just 2 glasses so that full and empty glasses alternate?

I invite you to comment on the puzzle, but please do not give the solution. The solution will be given later.

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