Magic ?

While browsing through the net i've found this interesting title "magic" (was browsing friendster bulletin). The article was about a certain equation when you supply your birthday into the equation.. it will return your birthday. =) Being such a curious guy i've delve in to see where the secret/trick lies.... (don't believe this is magic... too simple i think =P)

First let me post the message below (precedence of signs does not apply here).

Take the number of the month you were born, x 4 + 13 x 25 - 200 +
the day you were born, x 2 - 40 x 50 + last 2 digits of
the year you were born - 10500. Notice anything? Try it
out...

courtesy of Tokers

Complicated eh?? =P To make things simpler i've replaced the words in the article to change it into a simpler equation =) (Now that looks much better =P )see below:

Month of BDAY * 4 + 13 * 25 - 200 +
Day of BDAY * 2 - 40 * 50 +
Year of BDAY - 10500

So after looking at the equation for a few minutes... (yes minutes only =P i'm that intelligent.. =P) something caught my eye. see highlighted text below

Month of BDAY * 4 + 13 * 25 - 200 +
Day of BDAY * 2 - 40 * 50 +
Year of BDAY - 10500

Looking at the highlighted text it is obvious that these 4 numbers create the whole equation as 4 * 25 = 100 and 2 * 50 = 100. Removing all the "annoying numbers" we get:

Month of BDay * 100 +
Day of BDay * 100 +
Year of BDay

Sample:
April 18, 1982
04 * 100 = 400 + 18 = 418 * 100 = 41800 + 82 = 41882

Now where did the annoying numbers went to you ask?? by supplying 0 to birthdate we get:

0*4+13*25-200+0*2-40*50+0-10500 = 0

Therefore those numbers were present, just there to make a simple equation look complicated =)

Thus problem solved =) it was no magic after all =P, ya ain't gonna trick this genius with those easy trick questions =P hehe jks !