How does this website read your mind.

  • Thread starter jacksnap
  • Start date
  • #1
12
0
Hi ,
A friend sent me this website, and I was wondering how it worked,

http://www.regiftable.com/regiftingrobinpopup.html

obviously it cant read my mind, and its some kind of mathematical trick, I can initially see that all the answers i come up with are 18 apart and that gift is always the same, but why.

Jason
 

Answers and Replies

  • #2
679
2
Hah,it's a liittle tricky.
Any 2-digital number can be expressed as 10a+b,so what you do in fact is 10a+b-a-b=9a, always a multiple of 9, and you notice that the gifts labled by 9,18,27...are always the same!
 
  • #3
Mentallic
Homework Helper
3,798
94
haha I liked this :biggrin:

Seriously, its not even like those "think of any number, at 20, multiply by 50, subtract 100... etc." sort of doo-wackies. It's so simple it asks for just one thing from you and gets it right every time. I was so stumped as how it was done, lol post #2 spoilt the fun :tongue2:
 
  • #5
12
0
Thanks kof9595995 that explains it perfectly, isnt algebra wonderful.

I've just never seen it applied like that before.

fleem, thats an interesting site too, very clever.
 
  • #6
29
0
teheh, all the multiples of 9 are the same gifts
 

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