Help with geometry

Question

Let M be the midpoint of side BC on triangle ABC. Let N be the midpoint of AM. What is the

ratio of the area of triangle ABC to the area of triangle BNM?

Answer 1

Area of ΔABM = 1/2 of area of ΔABC; area of ΔBNM = 1/2 area of ΔABM. So, area of ΔBNM = 1/4 area of ΔABC. Because unknown ratio is equal 4