If you answer both questions correctly, you will find out the numerical code to decrypt this paragraph from Minerva McGonagall's letter:
Znal bs gur vapnagngvbaf sebz gung obbx ner sbezhyngrq va Yngva naq frireny cebsrffbef jub grnpu gur fhowrpg, fhpu nf Zvenaqn Tbfunjx, Svyvhf Syvgjvpx naq Nlynna Jbbqtngr, unir sbhaq gung gur fcryyf fbzrgvzrf jbex onqyl