View Single Post
  #24  
Old 08-26-2016, 05:23 PM
Leo Bloom Leo Bloom is offline
Member
 
Join Date: Jun 2009
Location: Here
Posts: 11,592
Quote:
Originally Posted by LSLGuy View Post
...

As has been said, it all starts from the fact that all 2 digit numbers are actually in the form of 10a+b. So as long as you hide a multiply by 10 and a single addition in amongst a bunch of do-nothing steps you've got a working puzzle. e.g. take a digit, add 3 then double the result, then subtract 6, then divide by 2. Magically the same digit pops out. etc.
But how is it seven?