In 1871 a mathematician called Augustus De Morgan died. De Morgan made this puzzling statement about his age and the year he was born in. He said that he was x years old in the year x 2.
Can you discover which year De Morgan was born in?
Do you think anyone living at this time can say the same thing
about their age and the year they were born?
(That doesn't mean that they have to have been born the same year
as Augustus!)
This is a cartoon of De Morgan drawn by one of his students!