Răspuns:
x = 4
x = 6
Explicație pas cu pas:
AM/AB = MN/BC
6/8 = 3/x
x = 3×8/6
x = 24/6
15/20 = x/8
x = 15×8/20
x = 120/20
AN/AC = MN/BC
x/(x+1) = 4/5
5x = 4x + 4
5x - 4x = 4