If you answer both questions correctly, you will find out the numerical code to decrypt this paragraph from Minerva McGonagall's letter:
Orabc R’m urtn cx bnwm hxd j lxamrju panncrwp oaxv cqn Qxpfjacb Blqxxu xo Vjprl, fqrlq R qjen cqn qxwxa cx unjm Uvri jkluvek,