Posted by Sharlet on Monday, September 13, 2010 at 6:07am.
This mystery number has 3 digits.Its digits are in the descending order. The hundreds' digit is two more than the ones' digit. If you add the 3 digit it gives you a dozen. Guess this mystery number?

Maths  MathMate, Monday, September 13, 2010 at 8:47am
If the digits are in strict descending order, then they must be [n+1]n[n1], the sum of which is 12, i.e.
n+1 + n + n1 = 12
Solve for n.

Maths  Maths girl, Tuesday, September 15, 2015 at 7:18am
The hundred digit is two more than the ones.
If you add three it will be 12.
Which means the hundreds is 123=9
To find the ones 9  2=7
Now we found 9_7.
To finish for sure the decending means 8
So the answer is 987.
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