How the?

[Ink]

1. Grab a calculator (you won't be able to do this in your head).
2. Key in the first three digits of your phone number (not your area code).
3. Multiply by 80.
4. Add 1.
5. Multiply by 250.
6. Add the last 4 digits of your phone number.
7. Add the last 4 digits of your phone number again.
8. Subtract 250.
9. Divide number by 2.

Did you get the same number as your phone number?

 

[bogdan]

(xxx*80+1)*250+yyyy+yyyy-250 = 250*80*xxx+250+2*yyyy-250 = 20000*xxx + 2*yyyy. When you divide by 2 you get 10000*xxx+yyyy = xxx0000+yyyy = xxxyyyy

 

[MetalShaun]

The algebra shows it well ^^. You are typing in your phone number all it is doing is taking you round the houses to confuse you.

 

[Markie]

Epic!!! I will show this topic to my friends

 

[jamescv7]

Well this is interesting technique.

 

[McLovin]

wow...this is quite interesting ...got me muddled

 

[MrXidus]

Now that's pretty interesting.

 

[jamescv7]

Well before our teacher show us the technique and seems I heard from giving a telephone number and solving it from the following. But I'm not sure about that.