Year mistiriusAsk your friend to write the year of his birth and first year he entered the school, then he should write down how old is she in the current year and the number of years since he first entered school.
In the meantime, you've written a number on paper and put it into his pocket. The number generated by your friend akn equal to the number you have entered into your pocket. What is the cause.?
The secret is, the amount by itself is always 2 times the current year. For example now in 2010 then you have to write 4020 (2x2010)
Examples of such
Year of birth = 1995
Years of school = 2000
Age now = 15
Years since the school = 10
Number = 4020
formula:
year of birth + year + old school + years now since school = n
