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A Math trick I found:
Follow these six steps:
First of all, pick the number of days a week that you would like to go out
(or eat pizza, whatever).
Multiply this number by 2.
Add 5.
Multiply it by 50.
If you have already had your birthday this year, add 1749. If you haven't,
add 1748.
Last step: Subtract the four digit year that you were born.
Results:
You should now have a three digit number:
The first digit of this was your original number ( i.e., how many times you
want to go out each week).
The second two digits are your age.
Supposedly, this is the only year (1999) it will ever work!