Another way...

The number "ab" is really 10a+b, and "ba" is really 10b+a.

So "ab-ba" is really

(10a+b) - (10b + a) = 9(a-b)

The number "c6" is thus a two-digit multiple of nine, ending in 6. So it can only be 36.

Posted By: Partial Angler on January 27th 2006 at 12:14:03

Message Thread

Easy puzzle (General Chat) - Partial Angler, Jan 27, 12:07:07
- 9-6 (n/m) (General Chat) - malkybarkid, Jan 27, 12:11:32
- 6? (General Chat) - Tricky Hawes, Jan 27, 12:10:19
  - sory - means c=3 (General Chat) - Tricky Hawes, Jan 27, 12:11:33
- 1,235,875,906 (n/m) (General Chat) - big_erics_shin, Jan 27, 12:09:04
- 3 (n/m) (General Chat) - Arganth, Jan 27, 12:08:08
  - Yep (General Chat) - Partial Angler, Jan 27, 12:08:32
    - Explainez-vous, please (n/m) (General Chat) - Hull Canary, Jan 27, 12:09:17
      - For A & B to be single digits, yet be interchangeable they must be multiples of nine. (General Chat) - Arganth, Jan 27, 12:11:38
        
        Another way... (General Chat) - Partial Angler, Jan 27, 12:14:03
      - It looks like "ab minus ba all over c6", to me, which I just don't get at all. (n/m) (General Chat) - Arizona Bay, Jan 27, 12:11:19
- 9 (n/m) (General Chat) - Nigel Gurgingon, Jan 27, 12:07:32
  - Nope (n/m) (General Chat) - Partial Angler, Jan 27, 12:08:01

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