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# Can anyone explain the 111 birthday trick

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posted on Feb, 8 2011 @ 05:12 PM

Same as my wife. This doesn't work if your birthday already passed.
She's 37 (now) and born in 74 (January). This would add up to 112 (38+74).
edit on 8-2-2011 by BishopLord because: (no reason given)

posted on Oct, 30 2011 @ 09:43 PM
Simple algebra.

The riddle calls for the following:

(birthYear - birthCentury) + ageThisYear = Sum

But, your Age this year can also be written as:

thisYear - birthYear = ageThisYear

Substituing in we get the following:

(birthYear - birthCentury) + (thisYear - birthYear) = Sum

Cancelling out birthYear, we get:

thisYear - birthCentury = Sum

What this means is that everyone born within the same century will always resolve to the same Sum.

If you were born in the 1800's:
2011 - 1800 = 211

If you were born in the 1900's:
2011 - 1900 = 111

If you were born in the 2000's:
2011 - 2000 = 11

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