﻿ Cool Maths Trick, know your age without telling me » Techie Buzz
Cool Maths Trick, know your age without telling me
By on September 26th, 2007

Just follow this cool little trick and I will be able to ascertain your actual age without you telling me

1. How many times do you eat your dinner in a restaurant in a week.
2. Now take this answer and multiply it with 2.
3. Add 5 to it.
4. Multiply the result with 50.
5. If this year your birthday has already passed this year add 1756 to the total, if it has already passed add 1757.
6. Now subtract the year you were born in from the total, so if you were born in 1960, subtract 1960 from the above total.

If you do not eat your dinner out at all you will only see a 2 digit number as the final results. If you go outside at least once a week to have your dinner you will get a three digit number as the final output.

Examples

Your birthday hasn’t passed this year yet and you eat dinner 3 times a week outside

now 3 x 2 = 6 + 5 = 11 * 50 = 550 + 1756 = 2306 – 1982 = 324

Your birthday has passed this year and you do not eat dinner outside at all

now 0 x 2 = 0 + 5 = 5 * 5- = 550 + 1757 = 2007 – 1982 = 25

The Surprise

Ok now the surprise, in the first example the first number out of the 3 digit number is the number of times you go out for dinner in a restaurant in a week and the last two digits is your current age.

In the second example since you do not eat my dinner out even once a week you got only two digits as the final result and the two digits that come up is your current age.

Go ahead do it yourself and tell me if it works or not.

Awesome isn’t it, well this was forwarded to me as a email but I figured out how this is able to figure out the exact age, well though the suspense will not be revealed today it will be done tomorrow, till then you have time to rack up your brain and think of the answer.

This trick is supposed to work only in the year 2007 but I have figured out how to do it for other forthcoming years too.

Do not forget to tell me your thoughts or answers on how this is done with your comments. Tomorrow I will reveal the answers.

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Author: Keith Dsouza
I am the editor-in-chief and owner of Techie Buzz. I love coding and have contributed to several open source projects in the past. You can know more about me and my projects by visiting my Personal Website. I am also a social networking enthusiast and can be found active on twitter, you can follow Keith on twitter @keithdsouza. You can click on my name to visit my Google+ profile.

Keith Dsouza has written and can be contacted at keith@techie-buzz.com.
• http://www.technospot.net/blogs/ Ashish Mohta

The trick is to push your sum to current year (plus minus 1) before you subtract your exact year of birth.

First Example: Its 2306, subtract 2306-300 = 2006 .
Second Example: Its 2007

1756 is figure which will push you to current century. Adding 1756 or 1757 is just a precaution for rounding or truncating.

Do tell me if I was right :)

• keith

Theoritically its right, but I need the algorithm that drives this as to how using those numbers are actually giving those correct results :)

• http://www.technospot.net/blogs/ Ashish Mohta

As I told it has to drive you closer to current year like 2006/2007

Lets Take a look, The calculation is around :(X * 2 + 5) * 50 + 1757

Now 2007 – 1757 = 250 . So in any case you need to add 250.

First Case:

So if you are not eating dinner i.e X=0 you are sure to add 250. Pretty Safe.

Second Case:

Now if I eat dinner the sum will add up to more than 2007 so you need to push that figure to first i.e 324 = 3( No of times dinner) and 24 is you age.

Now here is how it goes.

1. (1*2 + 5 )* 50 = 350
2. (2*2 + 5 )* 50 = 450
3. (3*2 + 5 )* 50 = 550
and so on…. and ALL WILL HAVE 50 at the end any number u take.

Now Lets break Figure 1757 = 1700 + 57 ( 50 + 7 )

Again a 50 which will add with above figure( 350 0r 450 ) to give value in 100′s and 7 which will get u “7″ in 2007

(X * 2 + 5) * 50 = Number Always Ending with 50 + 1757 = 2007 + X*100

Where X is number of dinner u take .

1. (1*2 + 5 )* 50 = 350 + 1757 = 2107 = 2007 + 100
2. (2*2 + 5 )* 50 = 450 + 1757 = 2207 = 2007 + 200
3. (3*2 + 5 )* 50 = 550 + 1757 = 2307 = 2007 + 300

Now lets say My Year of Birth is 1980. Now when you subtract

2307 – 1980 = 2007 + 300 – 1980 = 2007 – 1980 + 300 = 27 + 300 = 327

Thats should be the answer :)

• Nischal Mahnn

I tried this but I’m getting mad, i was born in 1996 and my end up as 11. My age is 15 so why I keep getting 11 or if I’m doing something wrong just please help me my birthday has passed this year.

I did something like this:
0*2+5*50+1757-1996=11

• http://indyankk.blogspot.com indyank

Yes Guess i had come to know of this trick some 15 years back….but the dinner stuff adds story to it…Nice and thanks for bringing my fond memories :)

• keith

cool, but sometimes you learn something that’s gone back just a day ;-)

• http://www.mysites-advisor.com Ken Xu

Ow! I was confused by your calculation. :) Not great in Math. Always got bad mark on it! But after see the detail of what Ashish described, I finally see a light! :D

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• Ankur Garg

for 2009 use 1758 instead of 1756 and 1759 instead of 1957.. and so on.. just keep adding 1 to the figure…

• andong

unfortunately, i got a wrong answer. this doesn’t work at all. better luck next time

• name

it doesnt work!!!!

• haha fail

didnt work! im not 8, im 13

• ausome

im not 106 im 12

• cool guy

Guys ,
People who are saying it didnt work , please read comments.
Simply substract 250 from current year and give that number to add to the total. Thats all ….

for example.

year 2012 it is 1762/1761
year 2011 it is 1761/1760 etc.