Answer:
5
Step-by-step explanation:
x can only go into 20x2 and 10x and 5 is the Gcf of these three numbers
10
By using intersecting chord theorem:
NH.HT=MH.HY
(x+20)*8=12*20
x+20=12*20/8
x+20=240/8
x+20=30
x=30-20
x=10
C
