Africa dwarfs Greenland: about 30,370,000 km² km² against 2,154,754 km² km². At true size Africa is about 14.1× larger — the whole of Greenland fits into Africa roughly 14 times.
The old Mercator map treated both about equally (1× vs 11.8× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Greenland fits 14× into Africa.