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Don't tell me your age; you probably would tell a falsehood anyway-
YOUR AGE BY STAR WARS MATHS
This is pretty neat.
DON'T CHEAT BY SCROLLING DOWN FIRST!
It takes less than a minute .
Work this out as you read ....
Be sure you don't read the bottom until you've worked it out!
This is not one of those waste of time things, it's fun.
1. First of all, pick the number of times a week that you would like to see a Star Wars movie
(more than once but less than 10)
2. Multiply this number by 2 (just to be bold)
3. Add 5
4. Multiply it by 50 -- I'll wait while you get the calculator
5. If you have already had your birthday this year add 1755 .
If you haven't, add 1754.
6. Now subtract the four digit year that you were born.
You should have a three digit number
The first digit of this was your original number
(i.e., how many times you want to see a Star Wars movie each week).
The next two numbers are
YOUR AGE! (Oh YES, it is!!!!!)
THIS IS THE ONLY YEAR (2005) IT WILL EVER WORK, SO SPREAD IT AROUND WHILE IT LASTS.
tell me how you went!
OK, here is the proof. Spoilers for those who want the secret to remain a secret.
1. First of all, pick the number of times a week that you would like to see a Star Wars movie
(more than once but less than 10)
Let us call that number n
2. Multiply this number by 2 (just to be bold)
So, now we have 2n
3. Add 5
So, the total is now 2n + 5
4. Multiply it by 50 -- I'll wait while you get the calculator
Which equals 50 x (2n + 5) which simplifies to 100n + 250
5. If you have already had your birthday this year add 1755 .
If you haven't, add 1754.
Assume that in this late stage of the year, you have had your birthday, in which case, our sum becomes 100n + 250 + 1755 or 100n + 2005. If you haven't had your birthday, the sum becomes 100n + 2004
6. Now subtract the four digit year that you were born.
If we say that y is your year of birth, then the sum ends up being 100n + (2005 - y) or 100n + (2004 - y).
You should have a three digit number
Which is true, unless you are older than 100 years old.
The first digit of this was your original number
(i.e., how many times you want to see a Star Wars movie each week).
This is also true, since the first digit of a three-digit number is the number of hundreds. Since n was our initial number, and the first term in the equation is 100n this is therefore true.
The next two numbers are YOUR AGE!
If you've had your birthday this year, your age is this year (2005) minus the year you were born (y), i.e. 2005 - y. If not, your age is last year (2004) minus the year you were born (y), i.e. 2004 - y.
To form the three digit number, add the first term to the second term, i.e. 100n + (2005 - y). Lo and behold, that was our final sum at the end of stage 6.
