If you answer both questions correctly, you will find out the numerical code to decrypt this paragraph from Minerva McGonagall's letter:
Espcpqzcp, esczfrs estd wpeepc T tygtep jzf lyo jzfc nzwwplrfpd qczx esp Czxl otite aczupne ez cpgtph lyo nzccpne esp pynslyexpyed zq esp Delyolco Mzzv zq Dapwwd.