>Hi Hilmar
>
>But I think this approach will give me 4 numbers. There must be only three.
>
>That's what makes it tricky. :-)
In your original example, you divided the number 10 into 4 parts, not 3.
Perhaps you should give a few more examples; I may not have understood what exactly you want.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)