No Card Mind Read

No Card Mind Read

EFFECT:
Think of a number between 1-10. just think on it!
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-got one?
-ok. now add 5.
-add another 5.
-take away the number you thought of at the start.
-times it by 2.
-does it = 20?

TRICK:
No, I cant mindread. I dont even end up knowing what the number is at the end.
lets say this:
s = starting number
a = (y + x) (or any other additions)
x = whatever 1 digit number you want
y = whatever 1 digit number you want
d = whatever!
t = [s + a - s] x d

if thats so, then the first step is:
s + a - s!
see that? since your creating then taking away s, then s never existed in the first place!
its kinda like saying s-s or 7-7. it = 0!
lets continue..
[s + a - s] x d = t
it will always = T!

so s + 5 + 5 - s x 2 = 20!