1- I am unsure of when to use "personnes" and when to use "gens." I had, "Disons une trentaine de gens."
2- Why is it "Ma mère adore le fruit de la passion et l'ananas" with the definite article but "...mais les enfants préféreraient du chocolat" ?
I thought this was a general opinion and therefore chose the definite article "le" for "chocolat," as well.