Hey men, look at this trick. It's avery simple trick.
First, choose a number...(you chose)
Now do the following :
a=the number you chose
1 a X 2=b
b=what you found from the 1
2 b + 2=c
c=what you found from the 2
3 c / 2=d
d=what you found from the 3
4 d - a= ?


Think it about a while and in 10 minutes i'll say the the mysterious number. Please don't say the numbers.Please.