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Finding someone's phone


Ask the person with a calculator:
1º) Enter her first 4 phone numbers;
2º) Multiply by 80;
3º) Sum 1;
4º) Multiply by 250;
5º) Add the last 4 numbers of her phone;
6º) Add once again the last 4 numbers of her phone;
7º) Subtract 250;
8º) Split 2.

The result will be that person's phone! Here's an example:

Phone 3663-3645
1st) 3663x80 = 293040
2º) 293040 + 1 = 293041
3rd) 293041 x 250 = 73260250
4º) 73260250 + 3645 = 73263895
5º) 73263895 + 3645 = 73267540
6º) 73267540 - 250 = 73267290
7º) 73267290 / 2 = 36633645

Result: 36633645

* Submitted by user Willian do Carmo Maciel dos Santos.