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"?"..."!" (Posted on 2011-02-11) Difficulty: 2 of 5

If the sum of 19968 and 22235 is expressed as 0063, and the product of 20108 and 19977 as 0362, then how would the difference between 20845 and 20116 be rendered?

See The Solution Submitted by broll    
Rating: 3.0000 (1 votes)

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Observation only | Comment 2 of 21 |
At the moment this is the extent of my thoughts:

   Add                            Mult                       Subt   
19968                           20108                     20845   
22235                           19977                     20116   
42203    0063         401697516   0362               729      ??

I had initial thoughts of keypad messaging (SMS) but the "0" bothers me [I'd have been more comfortable with accepting/dismissing that thought if I was a user of that technology].

I considered the possibility of a ring/modulus approach but those leading zeroes become an issue.

Since the first two processes yield a 4 digit numeric representation one might assume that the last is to be so represented.  Do we have a base (certainly not hexadecimal) where only the decimal digits of that base are used?

  Posted by brianjn on 2011-02-12 20:18:32
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