If you answer both questions correctly, you will find out the numerical code to decrypt this paragraph from Minerva McGonagall's letter:
Wt hvsm ofs gowr qcffsqhzm hvsm kwzz kcfy waasrwohszm, pih wt hvsm ofs gowr wbqcffsqhzm, hvsm qob zsor hc rwgoghsf.