Its always 13

Lets check your counting ability...

But first of all...GET YOUR CALCULATOR..!!!

Imagine three digits of numbers..(any numbers)

Write it two times on your calculator

(/) with 7

(/) with 11

(/) with your three digits of numbers

aaaand DONE..!!!

RESULT : IT ALWAYS BEEN ON "13"

PROVE :

example :  336

Write it 2 times .....336336

(/) with 7.....336336 : 7 = 48048

(/) with 11.....48048 : 11 = 4368

(/) with your three digits of numbers.....4368 : 336 = 13

1.