Yeah you'll eventually get into a negative number because you have the other one that started on 50 as well. And you can't ignore the ones that are less than zero as the formula relies on subtracting the amount you added so the sum of all is 100. To get around this you need to make it so that the numbers are decreased by the same percent, ie when you increase one, the rest all decrease by a fixed percentage.
I'll try to work out how to do this and get back to you soon.
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"I am the wrath of God. The earth I pass will see me and tremble." -Klaus Kinski as Don Lope de Aguirre
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