you could do with a multiple numerical question - but the questions have all to be subquestions of that question. In the advanced question settings you can set the maximum suum they have to meet.
Carsten, thought about this too, but I am not sure if this works in this case. I am not sure if you can limit each box to 5 and I think you can't proceed if you don't make it to the maximum... But worth a try, depends of course about the specific example.
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Each can be taken from attribute or another question (even Equation)
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