I see different decorations and some say made with a mixure of fondant and gum paste, why do they do that? And not just use one or the other? I am assuming there is some specific reason for it but don't know why?? Thanks

Decorations made with gum paste are generally stronger.

Fondant - - good taste, easy to work with, longer drying time
Gum paste - - nasty taste, dries fast and very stiff

A mixture of 50/50 gives one the best of both mediums.
Slows the gp from drying out too fast giving you more time to create your masterpiece.

Thank you for your replies, makes perfect sense!!!