Let a person write down the year of his birth and then the year of his marriage, or his first year of school.
Then he must write his age at the end of the present year, and to it the number of years he has been married, or the number of years since he began school.
In the meantime you have written a total on a paper and put it in an envelope. The total of the person's figures will be the same as the total you wrote.
Here is the reason: The sum will always be twice the number of the present year.
Thus, if the trick is done in 1928:
Year of Birth............... 1900
Year of marriage ........... 1925
Age ....................... 28
Years since marriage......... 3
Total .................... 38,56
The number 3856 is two times 19281
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