There is this thing called the Flash Mind Reader which at first glance appears to read your mind… oohhh… spooky.
Well obviously it doesn’t, but somebody said my girlfriend can have a free lunch if she could figure it out. I did a quick google for it and found this answer which I thought was a pretty clear explanation. Just putting it out there in case someone wants a free lunch in the future.
You select a 2-digit number, add together both digits and subtract the total from the original number. The final number is one of these:
00 - 0 = 0
01 - 1 = 0
02 - 2 = 0
...
10 - 1 = 9
11 - 2 = 9
..
19 - 10 = 9
20 - 2 = 18
21 - 3 = 18
..
29 - 11 = 18
30 - 3 = 27 etc .. see the pattern?
..
99 - 18 = 81
The answer is always:
x*10 + y - (x+y) = x*9, where x,y=0..9, therefore possible answers are 0,9,18,27,36,..,81.
By closer inspection of the symbols one finds that all ten possible answers share the same symbol, and that is the symbol that will be shown in the orb.
BTW, somebody owes google a free lunch. 