And to elaborate a little bit on Tpartners perfect answer:
I know that I can create equation questions in order to do that, but I don't know which formula to use.
You need to sum the subquestions with something like this:
Code:
{sum(SQ001,SQ002,SQ003,...)}
For the second part: if the text is short, you could just use an expression within a text display question.
If the recommendation text is longer or needs some nice formatting I would create different text display questions for the different recommendations and show/hide them via relevance equation.