Can you force the sum of two answer to equal a specific value?

I have uploaded two blogs to the eLearning community, they are waiting moderation. 

You can find it also in my personal blog:

https://blog.lilybiri.com/graded-surveys-radiobuttons-interaction

I have uploaded two blogs to the eLearning community, they are waiting moderation. I will try to combine them in one post on my personal blog. As soon as possible, will add the links here. 

So - if the sum of both A and B must equal 10 - the question is, as you originally stated - how do we force that?
My idea would be to create a single Text Entry Box for each pair and a variable for every question.
When a value for the first TEB is entered - the variable for the second is calculated such that the sum of the two is 10. We can simply display the value for the second.

If you require that the learner actually enter a value for every question then you would need to make it so that updating the second TEB would auto calculate and modify the first in order to keep it equal to 10. It is do-able but makes it a bit more complex, I think.

This can be done with actions.

Lieve may have another idea for this - looks like she is gonna get you hooked up with a solution.

Without going to a JavaScript solution - (as I often do) - you might consider having them rate one item which will then automatically set the value of the second to the difference from ten. This was the first thing that popped into my head.

As I consider more while typing - I thought there might be a need for additional context. I would have made this scenario from scratch - that is typically my default position. However, if you are wanting to use the Likert Scale Quiz slide - well, that probably changes things. I don't have an answer for that - I have actually never used that type of quiz slide.