Hi, MaguyPaul,
this is a typical scenario for Expression Manager.
Here you have a lot of opportunities to tailor your page (or several pages, which are displayed depending on the answers).
See:
www.limesurvey.org/manual/Expression_Manager#Tailoring.2FPiping
And you can see how things are done in the sample surveys which come with the Limesurvey installation pack.
In "/docs/demosurveys"
Well, you concealed your version of LS.
Very often students have to work with an outdated version that exists on the university server.
So, this always is the first information: which version.
You see it on the bottom of the admin page.
Best regards
Joffm