perplexus.info :: Numbers : A number well defined

A number well defined (Posted on 2018-10-25)

Half of my 2-digit number N is also a 2-digit number,
one of its digit being the sum of N's digit, the other their difference.
All 4 digits are different.

Find my number.

See The Solution Submitted by Ady TZIDON

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re: Too much information

| Comment 4 of 5 |

(In reply to Too much information by Steve Herman)

.... the fact that all 4 digits are different is not needed to solve the problem.

I agree

algebraic ... /...there is only one solution....

Not so:

6,8 fits the equation as well, but does not meet other requirements e.g. one-digit sum

Posted by Ady TZIDON on 2018-10-27 11:34:42

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