1. Can anyone figure out how this is done ??? I can't see any mathmatical connection to the solution.

2. There are a limited number of possible answers on the board. If you said 83, then 83-8-3=72. 99-9-9=81. Both of these answers and the rest all have the same answer on the board. The possible answers are :<span title="Spoiler: Highlight to reveal" style='color:#000000;background:#000000;padding:0p x 0.2em;'>[color=#666;margin-right: 0.2em]SPOILER:[/color] 81,72,63,54,45,36,27,18,9 </span>

The logic is that since we are starting with a 2 digit number, subtracting the 1 spot number brings you to the rounded to 10 spot and then subtracting the 10 spot number brings you down to the 1 spot. I know, lousy explaination, but there you go.

3. [quote name='DocWatson' post='773926' date='07-May-2009 00:24']Can anyone figure out how this is done ??? I can't see any mathmatical connection to the solution.

Any 2 digit number can be represented as 10A + B where A is 1 -> 9 and B is 0 -> 9.
If you subtract both digits from this, you always end up with a multiple of 9:

10A + B - A - B = 9A

You'll note that all the prizes for multiples of 9 are the same! Not so "gifted" after all!

Alan

4. Thanks guys !!!

One can always count on the Lounge Brain Trust when an intelligent solution is required.

5. Well, it didn't get some of my numbers correct - but that was mainly because I got my maths wrong <hangs head in shame>

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